Checklist of Ventura County Rare Plants[1]

By David L. Magney

California Native Plant Society, Channel Islands Chapter

Updated 21 May 2008

Ventura County is located in southern California, USA, along the east edge of the Pacific Ocean. The coastal portion occurs along the south and southwestern quarter of the County. Ventura County is bounded by Santa Barbara County on the west, Kern County on the north, Los Angeles County on the east, and the Pacific Ocean generally on the south (Figure 1, General Location Map of Ventura County).

Ventura County extends north to 34.9014ºN latitude at the northwest corner of the County. The County extends westward at Rincon Creek to 119.47991ºW longitude, and eastward to 118.63233ºW longitude at the west end of the San Fernando Valley just north of Chatsworth Reservoir. The mainland portion of the County reaches southward to 34.04567ºN latitude between Solromar and Sequit Point west of Malibu. When including Anacapa and San Nicolas Islands, the southernmost extent of the County occurs at 33.21ºN latitude and the westernmost extent at 119.58ºW longitude, on the south side and west sides of San Nicolas Island, respectively.

Ventura County occupies 480,996 hectares [ha] (1,188,562 acres [ac]) or 4,810 square kilometers [sq. km] (1,857 sq. miles [mi]), which includes Anacapa and San Nicolas Islands. The mainland portion of the county is 474,852 ha (1,173,380 ac), or 4,748 sq. km (1,833 sq. mi.) in area and ranges in elevation from sea level on the southwest to 2,692 meters [m] (8,831 feet [ft.]) above sea level at its northern border on Mount Piños (Figure 2, Shade Relief Map of Mainland Ventura County). There appears to be some discrepancy in the actual area covered by Ventura County, depending on the source. For example, according to the California County Fact Book, 1983 edition (California Supervisors Association of California 1983), Ventura County occupies an area of 482,668 ha (1,192,680 ac) or 2,999 sq. km (1,863.6 sq. mi), with 3,254 ha (8,040 ac) or 20.3 sq. km (12.6 sq. mi) of that as water. The discrepancy appears to be a little over 2,469 ha (6,100 ac), which does not correspond to the area occupied by the two islands within the County. However, thhe difference does appears to match the area occupied by a rectangular portion of the county in the northeast corner, where the Ventura County Board of Supervisors voted to give away approximately 6,100 acres to Kern County to accommodate a proposed development that Ventura County felt it could not provide adequate County services to.

Mainland Ventura County is located between 34º00' and 35º00'N latitude and 118º38' and 119º28'W longitude, excluding Anacapa and San Nicolas Islands, and is generally longer than wide. Anacapa Islands are the smallest and easternmost of the northern Channel Islands while San Nicolas Island is an outer southern Channel Island.

Figure 1. General Location Map of Ventura County

Figure 2. Shade Relief Map of Mainland Ventura County

The flora of Ventura County is comprised of approximately 2,321 native and naturalized vascular plant taxa, including those expected to occur but for which no vouchers are known (214 taxa). A total of 2,111 taxa (91.0%) are known to occur in the county that are supported by voucher specimens, or have been observed by the author. Approximately 1,833 taxa (78.9%) of the flora are native, and another 488 (21.0%) taxa are not native (based on a flora of 2,321 taxa). A small percentage (8.0%) of the flora taxa (186 taxa) are quite common (dominant or common), on a scale ranging from dominant to rare (dominant, common, occasional, scattered, uncommon, and rare). Many more of the plant taxa in Ventura County are uncommon to quite rare.

All the species (including varieties and subspecies, which are lower taxonomic units than full species) of native and naturalized plants are important components of the biodiversity of life in Ventura County. While most species do not recognize political boundaries, such as county boundaries, our government agencies set policies and manage land use and resources based on such jurisdictional boundaries.

This list represents a compilation of known records and observations (many by the author) of all native vascular plant species:

· With ten (10) or fewer populations within Ventura County;

· Listed by CNPS on a statewide basis (CNPS 2001);

· Listed by the US Fish and Wildlife Service as Threatened or Endangered under the federal Endangered Species Act;

· Listed by the California Fish and Game Commission as Rare, Threatened, or Endangered;

· Are at the limits of their distribution range (southernmost, northernmost, westernmost extent); or

· The Type Locality occurs within the County (then only the Type Locality is considered sensitive).

Some taxa are considered rare or uncommon throughout California, as established by the California Native Plant Society (CNPS) in it’s Inventory of Rare and Endangered Plants of California, sixth edition[2], even though more than ten populations are known from Ventura County, including Anacapa Islands and San Nicolas Island. Currently there are 1,203 taxa (51.8% of the county flora) included on this list of locally rare plants (including taxa rare statewide), which include taxa on the mainland and two islands (Anacapa and San Nicolas). Another 164 (7.1%) were appended that are likely to occur in the County but for which no voucher specimens or reliable locality data are available. These are included at the end of this list. Many of these potential additions are known to occur in adjacent counties and expected to occur in Ventura County. A total of 62 plants (2.7%) considered rare in Ventura County occur only on the Channel Islands (Anacapa and San Nicolas Islands) portion of the county. A number of taxa were deleted from this list when over ten occurrences were known to occur in Ventura County.

This list was compiled as the results of extensive research of the flora of Ventura County. It is based on extensive field searches; examination of specimens collected by others housed at public herbaria; and published reports. The author began research on the Ventura County flora in the late 1970s.

Soon to be published separately, Ventura County Rare Plants will provide much more information about those plants included in this checklist, including: a brief description of the plant, habitat preferences, associated plant communities, elevation range, and blooming period. That publication will include additional information for each taxon, including complete scientific name, known synonyms, common name(s), habit and size, rarity status, months it is in bloom or identifiable, and general and specific locality data, with supporting voucher collection information. Each specimen cited for a specific location includes the name of the collector, the collection number (or collection date if no number was assigned), and the herbarium in which it is stored (some duplicate specimens have been deposited in more than one herbarium). Location information is provided at two levels: a general geographic area, and then specific locations.

This list should be considered the best available information at the time of publication, as our knowledge of the Ventura County flora is dynamic, and growing with each botanical survey or foray. This checklist will be updated periodically and revised according to all new verifiable information provided. Occurrences of vascular plants found in Ventura County that add to or could change the status of any plant listed here should be submitted to the author via CNPS (attention: David Magney) or via email to david(at)magney(dot)org. Any lists submitted must be supported by voucher specimens that are deposited in a public herbarium, according to CNPS and California Botanical Society policies based on Ferren et al. (1995[3]).

Plants not included in CNPS’s Inventory, or listed by federal and state agencies, that have more than ten populations in Ventura County will be dropped from this list, except for those plants:

· representing range limits, such as the westernmost limit of the taxons range; or

· the “Type Locality” sites (“Type Locality” sites are the sites from which the plant was originally collected and formally described from, and is represented by a “Type Specimen”, for which a note occurs after the herbarium at which it is deposited as “Holotype” or “Isotype”).

For those plants that are otherwise relatively common in Ventura County, only the populations that represent the limit of a plants range should be considered of concern (as sensitive), with the remaining population(s) noted to provide perspective, but not considered sensitive/rare for the purposes of this checklist. Artemisia tridentata var. tridentata is an example of this, where it should be considered of local concern when it occurs in the western portion of the Santa Clara River Valley (the limit of its range) while the populations in the Upper Sespe Creek watershed and the northern part of the county are not of concern from a rarity perspective.

Special-status species are plants that are either listed as endangered or threatened under the Federal or California Endangered Special Acts; or considered to be rare under the California Native Plant Protection Act; or considered to be rare (but not formally listed) by resource agencies, professional organizations (e.g. California Native Plant Society), and the scientific community. For the purposes of this checklist, special-status species are further defined in Table 1, Definitions of Special-Status Plant Species.

Listed species are those taxa that are formally listed as endangered or threatened by the federal government (e.g. U.S. Fish and Wildlife Service [USFWS]) pursuant to the national Endangered Species Act or as endangered, threatened, or rare (for plants only) by the State of California (i.e. California Fish and Game Commission) pursuant to the California Endangered Species Act or the California Native Plant Protection Act.

The CNDDB Element Ranking system provides a numeric global and state ranking system for all special-status plant and wildlife species and rare habitats tracked by the CNDDB. The global rank (G-rank) is a reflection of the overall condition of an element (species or natural community) throughout its global range. The state ranking (S-rank) is assigned much the same way as the global rank, except state ranks in California often also contain a threat designation attached to the S-rank. This Element Ranking system is defined below in Table 2, Natural Diversity Data Base Element Ranking System. Not all special-status species considered in this checklist are tracked by the CNDDB, nor have global or state rarity ranking been given to them; therefore, the author has applied the rules described above to “rank” those special-status species lacking such ranking. Taxa for which Global and State rarity ranking have been devised here are followed by a “?” in parentheses, denoting tentative assignment.

Table 1. Definitions of Special-Status Plant Species

1. Plants legally protected under the California and Federal Endangered Species Acts or under other regulations.

2. Plants considered sufficiently rare by the scientific community to qualify for such listing; or

3. Plants considered to be sensitive because they are unique, declining regionally or locally, or are at the extent of their natural range.

Special-Status Plant Species

¨ Plants listed or proposed for listing as threatened or endangered under the Federal Endangered Species Act (50 CFR 17.12 for listed plants and various notices in the Federal Register for proposed species).

¨ Plants that are Category 1 or 2 (species of special concern) candidates for possible future listing as threatened or endangered under the Federal Endangered Species Act (55 CFR 6184, February 21, 1990).

¨ Plants that meet the definitions of rare or endangered species under the CEQA (State CEQA Guidelines, Section 15380).

¨ Plants considered by the CNPS to be "rare, threatened, or endangered" in California (Lists 1A, 1B, and 2 in CNPS [2001][4]).

¨ Plants listed by CNPS as plants about which we need more information and plants of limited distribution (Lists 3 and 4 in CNPS [2001]).

¨ Plants listed or proposed for listing by the State of California as threatened or endangered under the California Endangered Species Act (14 CCR 670.5).

¨ Plants listed under the California Native Plant Protection Act (California Fish and Game Code 1900 et seq.).

¨ Plants considered sensitive by other federal agencies (i.e. U.S. Forest Service, Bureau of Land Management) or state and local agencies or jurisdictions.

¨ Plants considered sensitive or unique by the scientific community or occurring at the limits of its natural range (State CEQA Guidelines, Appendix G).

CNPS’s Inventory of Rare and Endangered Plants of California[5] categorizes rare California plants into one of five lists (1A, 1B, 2, 3, & 4) representing the five levels of species status, one of which is assigned to a sensitive species to indicate its status of rarity or endangerment and distribution. A CNPS List is a more general designation than the three separate sets of information provided in a CNPS R-E-D Code (see the CNPS Inventory for definitions). However, the CNPS List is a significant designation in terms of a species’ overall status throughout all of California, and it works well in conjunction to the specifications of the R-E-D Code. The CNPS R-E-D Code is a three-numbered numeric ranking, which is assigned to a special-status species, consisting of one number (1, 2, or 3) for each of the three categories (Rarity-Endangerment-Distribution). Each number accurately describes the species’ population levels and distribution patterns within each category.

As described for the NDDB ranking, not all special-status species (most) considered in this checklist are tracked by CNPS, nor have R-E-D codes been given to them; however, the author has applied the rules described above to “rank” those special-status species lacking such ranking to either “rare” or “uncommon”; however, these rankings are not included in the checklist. Rather the occurrence rankings for each are provided in the Ventura County Rare Plants and in the Flora of Ventura County to be published in 2006 by the author.

The large number of taxa on this list is the result of several factors:

1. Development in Ventura County has eliminated a majority of the natural vegetation in the southern half of the County, eliminating many occurrences of native plant species;

2. A number of taxa found nowhere else are present in Ventura County, local endemics, and several of these are listed as threatened or endangered by either the California Department of Fish and Game or the U.S. Fish and Wildlife Service;

3. Ventura County is geographically situated such that floral influences from the north, south, and east enter the County at its edges (limits of some species’ ranges);

4. Anacapa and San Nicolas Islands support many species found only on the California Channel Islands, including island endemics;

5. Ventura County is topographically and climatically diverse, providing numerous habitats for uncommon and rare species; and

6. Botanical surveys have not been conducted systematically everywhere in the County. In other words, the flora of Ventura County is not fully understood or documented, and additional populations of a number of the plants listed below likely occur in the County, we just aren’t aware of them yet. Regardless, significant collecting has occurred in the County over the last 150 years, and the author has a reasonably good understanding of the flora.

This list was compiled according to definitions under the California Environmental Quality Act (CEQA) under Initial Study Checklist Section 6, Subsections A and E. Projects reviewed under CEQA should consider impacts to one or more of the species included in this checklist as potentially significant. Generally, if a project would impact a population of one or more of the plants listed herein, that/those impact(s) should be considered significant unless substantial evidence is provided that may support an alternate conclusion.

What significance does a list of locally rare species have under CEQA?

The following answer is provided by John Buse, Esq., of the Environmental Defense Center of Ventura, California[6]. The CEQA Guidelines provide that a lead agency shall find that a project may have a significant effect on the environment if the project “… has the potential to … reduce the number or restrict the range of an endangered, rare or threatened species …”. Guidelines §15065(a). In addition, the CEQA Guidelines Appendix G Environmental Checklist Form considers whether a project would “have a substantial adverse effect, either directly or through habitat modifications, on any species identified as a candidate, sensitive, or special status species in local or regional plans, policies, or regulations …”.

According to the CEQA Guidelines, a species is considered “rare” when either:

(A) Although not presently threatened with extinction, the species is existing in such small numbers throughout all or a significant portion of its range that it may become endangered if its environment worsens; or

(B) The species is likely to become endangered within the foreseeable future throughout all or a significant portion of its range and may be considered “threatened” as that term is used in the Federal Endangered Species Act. Guidelines §15380(b)(2).

Table 2. Natural Diversity Database Element Ranking System

Global Ranking (G)
G1	Less than 6 viable element occurrences (populations for species) OR less than 1,000 individuals OR less than 809.4 hectares (ha) (2,000 acres [ac]).
G2	6 to 20 element occurrences OR 809.4 to 4,047 ha (2,000 to 10,000 ac).
G3	21 to 100 element occurrences OR 3,000 to 10,000 individuals OR 4,047 to 20,235 ha (10,000 to 50,000 ac).
G4	Apparently secure; this rank is clearly lower than G3 but factors exist to cause some concern (i.e. there is some threat, or somewhat narrow habitat).
G5	Population or stand demonstrably secure to ineradicable due to being commonly found in the world.
GH	All sites are historic; the element has not been seen for at least 20 years, but suitable habitat still exists.
GX	All sites are extirpated; this element is extinct in the wild.
GXC	Extinct in the wild; exists in cultivation.
G1Q	The element is very rare, but there is a taxonomic question associated with it.
Subspecies Level Subspecies receive a T-rank attached to the G-rank. With the subspecies, the G-rank reflects the condition of the entire species, whereas the T-rank reflects the global situation of just the subspecies or variety. For example: Chorizanthe robusta var. hartwegii. This plant is ranked G2T1. The G-rank refers to the whole species range (i.e. Chorizanthe robusta, whereas the T-rank refers only to the global condition of var. hartwegii.
State Ranking (S)
S1	Less than 6 element occurrences OR less than 1,000 individuals OR less than 809.4 ha (2,000 ac). S1.1 = very threatened S1.2 = threatened S1.3 = no current threats known
S2	6 to 20 element occurrences OR 3,000 individuals OR 809.4 to 4,047 ha (2,000 to 10,000 ac). S2.1 = very threatened S2.2 = threatened S2.3 = no current threats known..
S3	21 to 100 element occurrences OR 3,000 to 10,000 individuals OR 4,047 to 20,235 ha (10,000 to 50,000 ac). S3.1 = very threatened S3.2 = threatened S3.3 = no current threats known
S4	Apparently secure within California; this rank is clearly lower than S3 but factors exist to cause some concern (i.e. there is some threat, or somewhat narrow habitat). NO THREAT RANK.
S5	Demonstrably secure to ineradicable in California. NO THREAT RANK.
SH	All California sites are historic; the element has not been seen for at least 20 years, but suitable habitat still exists.
SX	All California sites are extirpated; this element is extinct in the wild.

Notes: 1. Other considerations used when ranking a species or natural community include the pattern of distribution of the element on the landscape, fragmentation of the population/stands, and historical extent as compared to its modern range. It is important to take a bird’s eye or aerial view when ranking sensitive elements rather than simply counting element occurrences.

2. Uncertainty about the rank of an element is expressed in two major ways: by expressing the rank as a range of values (e.g., S2S3 means the rank is somewhere between S2 and S3), and by adding a ? to the rank (e.g. S2?). This represents more certainty than S2S3, but less than S2. (CNDDB 2002.)

Species already listed under the California or federal ESA shall be presumed to be endangered, rare, or threatened. Guidelines §15380(c). A species not currently listed shall nevertheless be considered to be endangered, threatened, or rare if it meets the criteria in the CEQA definitions of “endangered” or “rare”. The term “sensitive” species, which appears in the Appendix G checklist, is not defined in CEQA.

If a species is considered locally rare due to its limited occurrence within a political boundary, such as the County of Ventura, and if the species’ local population constitutes a significant portion of its range, the species must be considered a rare species under CEQA. The mere placement of a species on a list of locally rare species is probably not enough to meet the CEQA criteria for endangered, threatened, or rare species. However, if the list contains some additional explanation indicating why the species meets the CEQA criteria, such as the fact that the local population constitutes a significant portion of the species’ range, the list should provide substantial evidence of rarity.

If the CEQA criteria are satisfied, it is irrelevant that a species is relatively common in other locations. For example, the Pacific Coast populations of the Snowy Plover are listed as threatened under the federal ESA, despite the fact that inland populations are relatively common and are not protected. The existence of the non-listed populations does not diminish the Snowy Plover’s status as a endangered, threatened, or rare species under CEQA. By extension, if the Pacific Coast populations of the Snowy Plover were not listed as threatened, these populations would still be considered endangered, threatened, or rare under CEQA. Accordingly, the special status for Snowy Plover in Ventura County under CEQA would still apply even if Snowy Plover was relatively common in, for example, Mono County. Assertions implying that a species necessarily does not warrant inclusion on a list of locally rare species if it is common elsewhere in California simply because it occurs rarely in Ventura County within a political boundary are incorrect. As the Snowy Plover example indicates, there will be instances when a locally rare species must be considered rare under CEQA despite the species’ common occurrence elsewhere in California.

Snowy Plover on the Pacific Coast is protected under the federal ESA based on the concept of a “distinct population segment” (DPS). Something similar to the DPS concept could be used to determine whether a locally rare species is, in fact, endangered, threatened, or rare under CEQA. The federal ESA allows a DPS, defined according to geographic or reproductive isolation, to be treated as a “species”. Therefore, as in the Snowy Plover example, a DPS can be listed even though the populations of the taxonomic species are common elsewhere. CEQA does not preclude use of the DPS concept to assist in understanding whether a species is endangered, threatened, or rare based on its local rarity; on the contrary, the CEQA Guidelines definition of “rare” appears to invite the consideration of similar circumstances that would inform the determination of a DPS under the federal ESA.

Under CEQA, lead agencies have considerable discretion in determining whether a species should be considered rare or sensitive. See, for example, the State CEQA Guidelines Appendix G checklist cited above, which indicates that lead agencies may designate candidate, sensitive, or special-status species in local or regional plans, policies, or regulations. A list of locally rare or sensitive species, if it is developed based on evidence that the local rarity meets the CEQA criteria for rarity, will effectively establish a rebuttable presumption of significance for species that may be adversely affected by a project. In this respect, a list of locally rare species as presented below will function in a manner similar to the threshold of significance that a lead agency may establish. CEQA requires, however, that thresholds of significance for general use in a lead agency’s environmental review process “must be adopted by ordinance, resolution, rule, or regulation, and developed through a public review process and be supported by substantial evidence.” Guidelines §15064.7. For a list of locally rare or sensitive species to function as a set of thresholds of significance, therefore, the list should be adopted through a public review process. Even if the list is not adopted through a public review process, it will establish substantial evidence of rarity if it is accompanied by additional information showing, for example, that the local occurrences of a listed species constitute a substantial portion of the species’ range.

CNPS believes that this list of locally rare plants meets the definitions of rarity, at least locally, to satisfy consideration under CEQA. This checklist is supported by substantial evidence in the files of the author and data obtained from public herbaria and knowledgable local botanists. Many of the taxa listed in this checklist are also listed by CNPS as rare or sensitive statewide, as well as those taxa formally listed under the California and/or federal ESA.

This checklist is updated regularly based on new information on the Ventura County flora. Species are added or deleted from this list as the new data warrant; therefore, be sure to obtain the most up-to-date version of this checklist. For example, for this update, compared to the 3 August 2007 version, 9 taxa were added, 20 were dropped (listed at end of this list), 13 had their rarity status changed (usually lowered from Rare to Uncommon), and 2 taxa were added to the “expected to occur” list while 9 taxa where removed. Changes in nomenclature were also made, where appropriate. Future changes to this list will not likely be as dramatic as the status of the flora of Ventura County is now better understood after extensive searches of California public herbaria were conducted through the Jepson Herbarium on-line Consortium database.

The most up-to-date version can be downloaded (as a PDF) from the Channel Islands Chapter CNPS website at www.cnpsci.org, or by contacting the author directly. Please send your notes on corrections, errors, and plant populations/occurrences you are aware of that may not be on this checklist to the author: David Magney, P.O. Box 1346, Ojai, CA 93024-1346 or via email at david(at)magney(dot)org. Also contact the author if you need any specific locality data on any particular taxon included in this checklist.

Checklist of Rare Plants

Scientific Name[7] Common Name[8]

Abies lowiana (Gordon & Glendinning) E. Murray California White Fir (U) LPNF

Abronia maritima Nutt. ex S. Watson X A. umbellata Lam. Hybrid Sand-verbena (R)

Abronia maritima Nutt. ex S. Watson Red or Sticky Sand-verbena (U) CNPS 4

Abronia pogonantha Heimerl Desert Sand-verbena (R)

Abronia turbinata Torr. ex S. Watson Turbinate Sand-verbena (R)

Abronia villosa S. Watson var. aurita (Abrams) Jeps. Woolly Sand-verbena (R)

Acanthomintha obovata var. cordata Jokerst Heartleaf Thornmint (U)

Acanthoscyphus [Oxytheca] parishii (Parry) Small var. parishii Parish’s Oxytheca (R) CNPS 4.2

Achnatherum aridum (M.E. Jones) Barkworth Mormon Needlegrass (R)

Achnatherum occidentalis (Thurber) Barkworth ssp. occidentalis Western Needlegrass (R)

Achnatherum occidentalis ssp. pubescens (Vasey) Barkworth Elmer Needlegrass (R)

Achnatherum parishii (Vasey) Barkworth Parish Needlegrass (R)

Achnatherum thurberianum (Piper) Barkworth Thurber Needlegrass (R)

Achyrachaena mollis Schauer Blow-Wives (U)

Adenostoma sparsifolium Torrey Red Shank, Ribbon-bush (U)

Agoseris elata (Nuttall) E. Greene Tall Mountain Dandelion (R)

Agoseris heterophylla var. cryptopleura Greene Mountain Dandelion (U)

Agrostis exarata Trin. Western or Spike Bentgrass (U)

Scientific Name Common Name

Agrostis hallii Vasey Hall’s Bentgrass (R)

Agrostis pallens Trin. Thingrass (R)

Agrostis stolonifera var. palustris (Hudson) Pers. Creeping Bentgrass (U)

Alisma plantago-aquaticum L. Common or Broadleaf Water-plantain (R)

Allium amplectens Torrey Narrowleaf Onion (R)

Allium cratericola Eastw. Cratered Onion (R)

Allium denticulatum (Traub) D. McNeal Dentate Fringed Onion (R)

Allium diabloense (Traub) D. McNeal Diablo Onion (U)

Allium haemaetochiton S. Watson Red-skinned Onion (U)

Allium howellii var. clokeyi Traub Mount Pinos Onion (R, Type) CNPS 1B

Allium lacunosum var. davisiae (M.E. Jones) D. McNeal Davis Onion (R, W Limits)

Allium lacunosum S. Watson var. lacunosum Pitted Onion (R)

Allium monticola Davidson Mountain Onion (R)

Allium parryi S. Watson Parry Fringed Onion (R)

Allium parvum Kellogg Small Onion (R)

Allium peninsulare Lemmon var. peninsulare Peninsular Onion (R)

Allium praecox Brandegee Early Onion (R)

Allium sanbornii Alph. Wood var. sanbornii Sanborn Onion (R)

Allium tribracteatum Torrey Three-bracted Onion (R)

Allium vineale L. Wild Garlic (R)

Allophyllum divaricatum (Nuttall) A.D. Grant & V. Grant Divaricate Allophyllum (R)

Allophyllum gilioides (Bentham) A.D. Grant & V. Grant ssp. gilioides Straggling Gilia (U)

Alnus incana ssp. tenuifolia (Nuttall) Breitung Mountain Alder (R, Disjunct, S Limits)

Alopecurus carolinianus Walter Carolina Foxtail (R)

Alopecurus saccatus Vasey Pacific Foxtail (R)

Amaranthus blitoides S. Watson Prostrate Amaranth (U)

Amaranthus californicus (Moq.) S. Watson California Amaranth (R)

Amaranthus palmeri S. Watson Palmer Amaranth (U)

Amaranthus powellii ssp. bouchenii (Thell.) Costea & Carretero Bouchenl Amaranth (R)

Amaranthus powellii S. Watson ssp. powellii Powell Amaranth (U)

Ambrosia chamissonis (Less.) E. Greene Beach Bur (U)

Ambrosia confertiflora DC. Weak-leaved Burweed or Bur-sage (R)

Ambrosia salsola var. fasiculata (A. Nelson) Stother & B.G. Baldwin White Burrobrush (R)

Ambrosia salsola (T.&G. Ex G.) Stother & B.G. Baldwin var. salsola Burrobrush (R)

Amelanchier alnifolia var. pumila (Nuttall) Nelson Alderleaf Service-berry (R)

Amelanchier pallida E. Greene Western or Pallid Service-berry (R, Type)

Amelanchier utahensis Koehne Utah Service-berry (R)

Ammannia coccinea Rottb. Long-leaved or Purple Ammannia (R)

Amsinckia douglasiana A. DC. Douglas Fiddleneck (R)

Amsinckia menziesii (Lehm.) Nelson & J.F. Macbr. var. menziesii Common or Menzeis Fiddleneck (U)

Amsinckia spectabilis Fischer & C. Meyer var. spectabilis Showy Fiddleneck (R)

Amsinckia tessellata Gray var. tessellata Devil’s Lettuce, Tessellate Fiddleneck (R)

Amsinckia tessellata var. gloriosa (Suksd.) Hoover Glorious Fiddleneck (R)

Ancistrocarphus filagineus Gray Woolly Fishhooks (U)

Andropogon glomeratus var. pumilus Vasey ex Dewey Bushy Bluestem (R)

Andropogon glomeratus var. scabriglumis C.S. Campbell Southwestern Bushy Bluestem (U)

Androsace elongata ssp. acuta (E. Greene) G. Robb. Rock-jasmine (R)

Anisocoma acaulis Torrey & A. Gray Scale Bud (U)

Antennaria dimorpha (Nuttall) Torrey & A. Gray Low Everlasting (R)

Antirrhinum coulterianum Bentham ssp. coulterianum White Snapdragon (U)

Antirrhinum nuttallianum Benth. ssp. nuttallianum Nuttall Snapdragon (R)

Antirrhinum nuttallianum ssp. subsessile (A. Gray) D. Thompson Nuttall Snapdragon (R)

Antirrhinum ovatum Eastwood Oval-leaved Snapdragon (R)

Aphanes occidentalis (Nuttall) Rydb. Dew-cup, Lady’s Mantle (R)

Aphanisma blitoides Moq. Aphanisma (R)

Apocynum androsaemifolium L. Bitter Dogbane (U)

Scientific Name Common Name

Apocynum Xmedium E. Greene (A. androsaemifolium ssp. a. var. incanum X A. cannabinum var. hypericifolium) Bitter Dogbane (R)

Aquilegia eximia Van Houtte ex Planchon Van Houtte Columbine (R)

Aquilegia formosa var. truncata (Fischer & C.A. Meyer) Baker Truncate Crimson Columbine (U)

Arabis breweri S. Watson var. breweri Brewer Rock Cress (R, S Limits)

Arabis hoffmannii (Munz) Rollins Hoffmann Rock Cress (R/E)

Arabis holboellii var. retrofracta (Graham) Rydb. Holboell Rock Cress (R)

Arabis pulchra M.E. Jones var. gracilis M.E. Jones Desert Rock Cress (R, SW Limits)

Arabis repanda S. Watson var. repanda Yosemite Rock Cress (U)

Aralia californica S. Watson Elk Clover, Spikenard (R)

Arbutus menziesii Pursh Pacific Madrone (R)

Arceuthobium abietinum (Engelm.) Hawksw. & Wiens Dwarf Fir Mistletoe (R)

Arceuthobium californicum Hawksworth & Wiens Sugar Pine Dwarf Mistletoe (R)

Arceuthobium campylopodum Engelm. Western Dwarf Mistletoe (U)

Arceuthobium cyanocarpum Coulter & A. Nelson Limber Pine Dwarf Mistletoe (R)

Arceuthobium divaricatum Engelm. Pinyon Dwarf Mistletoe (U)

Arceuthobium occidentale Engelm. Foothill Pine Dwarf Mistletoe (R)

Arctostaphylos canescens Eastw. Hoary Manzanita (R)

Arctostaphylos glandulosa Eastw. X.A. glauca Lindley Eastwood-Bigberry Manzanita Hybrid (R)

Arctostaphylos glandulosa ssp. adamsii (Munz) Munz Adams Eastwood Manzanita (R)

Arctostaphylos glandulosa ssp. cushingiana (Eastw.) Keeley, Vasey & Parker Cushing’s Eastwood Manzanita (R)

Arctostaphylos patula Greene Greenleaf Manzanita (R)

Arctostaphylos pungens H.B.K. Pungent Manzanita (U)

Aristida adscensionis L. Sixweeks Threeawn Grass (R)

Aristida divaricata Humb. & Bonpl. ex Willd. Poverty Threeawn Grass (R)

Aristida ternipes var. hamulosa (Henrard) J.S. Trent Hook Threeawn Grass (R)

Artemisia ludoviciana Nuttall ssp. ludoviciana Silver or Western Mugwort (R)

Artemisia nesiotica Raven Island Sagebrush (R)

Artemisia tridentata ssp. parishii (Gray) H.M. Hall & Clements Parish Great Basin Sagebrush (R, W Limits)

Artemisia tridentata ssp. vaseyana (Rydb.) Beetle Vasey Great Basin or Mountain Sagebrush (R)

Arthrocnemum [Salicornia] subterminalis (Parish) Standley Common or Parish Glasswort (R)

Asclepias erosa Torrey Desert Milkweed (R)

Asclepias vestita Hook. & Arn. Woolly Milkweed (R)

Aspidotis californica (Hooker) Nuttall ex Copeland California Lace Fern (U)

Asplenium vespertinum Maxon Western Spleenwort (R)

Aster ascendens Lindley Long-leaved Aster (R)

Aster chilensis Nees Common California Aster (U)

Aster greatae Parish Greata’s Aster (R)

Aster lanceolatus ssp. hesperius (Gray) Semple & Chmielewski Siskiyou Aster (R)

Aster lentus E. Greene Suisun Marsh Aster (R)

Astragalus asymmetricus E. Sheldon Cockeyed Milkvetch (R)

Astragalus brauntonii Parish Braunton Milkvetch (R) Listed Endangered

Astragalus coccineus Brandegee Scarlet Milkvetch (R)

Astragalus curtipes A. Gray San Luis Obispo Milkvetch (R)

Astragalus didymocarpus Hook. & Arn. var. didymocarpus Two-seeded Milkvetch (U)

Astragalus didymocarpus var. dispermus (A. Gray) Jepson Disperse Two-seeded Milkvetch (R)

Astragalus didymocarpus var. milesianus (Rydb.) Jeps. South Coast Two-seeded Milkvetch (R)

Astragalus didymocarpus var. obispoensis (Rydb.) Jeps. San Luis Obispo Two-seeded Milkvetch (R)

Astragalus douglasii var. parishii (Gray) M.E. Jones Parish Milkvetch (R)

Astragalus filipes Gray Thread-leaved Locoweed (U)

Astragalus gambelianus E. Sheldon Dwarf Locoweed (U)

Astragalus lentiginosus Hook. var. diphysus Freckled Locoweed (R)

Astragalus lentiginosus Hooker var. fremontii (A. Gray) S. Watson Fremont Spotted Locoweed (U)

Astragalus lentiginosus var. nigricalycis M.E. Jones Black-sepaled Freckled Locoweed (R)

Astragalus lentiginosus var. sierrae M.E. Jones Bear Valley Milkvetch (R, CNPS 1B)

Astragalus leucolobus M.E. Jones Bear Valley Woollypod (R)

Astragalus leucopsis Torrey var. leucopsis Coast Rattleweed (R)

Scientific Name Common Name

Astragalus macgregorii (Rydb.) Tidestr. MacGregor Locoweed (R, Type)

Astragalus macrodon (Hook. & Arn.) Gray Salinas Valley Milkvetch (R)

Astragalus miguelensis Greene San Miguel Milkvetch (R)

Astragalus nuttallii (Torrey & A. Gray) J.T. Howell Nuttall’s Milkvetch (R)

Astragalus oxyphysus Gray Robust Milkvetch (R)

Astragalus pachypus var. jaegeri Munz Jaeger Milkvetch (R, N Limits)

Astragalus pomonensis M.E. Jones Pomona Locoweed (R)

Astragalus purshii Douglas ex Hooker var. purshii Pursh’s Woollypod Milkvetch (R)

Astragalus pycnostachyus var. lanosissimus (Rydb.) Munz Ventura Marsh Milkvetch (R/E)

Astragalus traskiae Eastwood Trask Locoweed or Milkvetch (R)

Astragalus trichopodus (Nutt.) Gray var. trichopodus Three-pod Milkvetch (U)

Astragalus trichopodus var. lonchus (M.E. Jones) Barneby Three-pod Milkvetch (U)

Astragalus whitneyi Gray var. whitneyi Whitney Locoweed (R)

Astragalus whitneyi var. pinosus Elmer Mount Pinos Locoweed (R, Type)

Athysanus pusillus (Hook.) Greene Dwarf Athysanus (U)

Atriplex argentea var. mohavensis M.E. Jones Mojave Silverscale (R)

Atriplex californica Moq. California Saltbush (U)

Atriplex canescens ssp. linearis (S. Watson) H.M. Hall & Clements Narrowleaf Fourwing Saltbush (R)

Atriplex coulteri (Moq.) D. Dietr. Coulter Saltbush (R)

Atriplex lentiformis (Torrey) S. Watson ssp. lentiformis Big Saltbush, Quailbrush (U, W Limits)

Atriplex leucophylla (Moq.) D. Dietr. Whiteleaf, Beach Saltbush or Seascale (U)

Atriplex pacifica Nelson South Coast Saltbush (R)

Atriplex polycarpa (Torrey) S. Watson Common Saltbush, Allscale (R)

Atriplex serenana var. davidsonii (Standley) Munz Davidson Bractscale (R)

Atriplex serenana Nelson var. serenana Bractscale (R)

Atriplex subspicata (Nutt.) Rydb. Saline Saltscale (R)

Atriplex triangularis Willd. Spearscale (U)

Atriplex watsonii Nelson Matscale (R)

Azolla filiculoides Lam. Duckweed Fern (U)

Baccharis douglasii DC. Marsh Baccharis, Douglas False-willow (U)

Baccharis emoryi Gray Emory Baccharis (R)

Baccharis malibuensis Beauchamp & Henrickson Malibu Baccharis (R)

Baccharis plummerae Gray Plummer Baccharis (U) CNPS List 4

Barbarea orthoceras Ledeb. American Wintercress (U)

Batis maritima L. Saltwort, Beachwort (R)

Berberis dictyota Jeps. Dull-leaf or Jeps. Holly-leaved Barberry (R)

Berberis pinnata ssp. insularis Munz Island Barberry (R)

Berula erecta (Huds.) Coville Cutleaf Water-parsnip (R)

Bidens frondosa L. Sticktight (R)

Bidens laevis (L.) Britton, Sterns & Pogg. Bur-marigold (R)

Bloomeria crocea var. montana (E. Greene) Ingram Mountain Goldenstars (U)

Bolboschoenous maritimus (L.) Palla var. paludosus (Nelson) Koyama Saltmarsh Bulrush (R)

Bolboschoenous maritimus X B. robustus Hybrid Bulrush (R)

Bolboschoenous robustus (Pursh) Soják, Čas. Nár. Seashore Bulrush (R)

Boschniakia strobilacea Gray California Ground Cone (R)

Bothriochloa barbinodis (Lagasca) Herter Cane Bluestem (U)

Botrychium simplex E. Hitchc. Least Moonwort, Little Grapefern (R)

Bowlesia incana Ruiz Lopez & Pavon Hoary Bowlesia (U)

Boykinia occidentalis T. & G. Santa Lucia Brookfoam (R)

Boykinia rotundifolia C. Parry Roundleaved Boykinia (R)

Brickellia californica (T. & G.) Gray X B. nevinii Gray California-Nevin Brickellbush Hybrid (R)

Brickellia desertorum Coville Desert Brickellbush (R)

Brickellia multiflora Kellogg Gum-leaved Brickellbush (R)

Brodiaea coronaria (Salisbury) Jepson ssp. coronaria Crown Brodiaea (R)

Brodiaea terrestris ssp. kernensis (Hoover) Niehaus Harvest Brodiaea (R)

Bromus arizonicus (Shear) Stebbins Arizona Brome (U)

Scientific Name Common Name

Bromus laevipes Shear Woodland Brome (R)

Bromus orcuttianus (Shear) A. Hitchc. Orcutt Brome (R)

Bromus pseudolaevipes Wagnon Woodland Brome (R)

Cakile edentula (Bigelow) Hooker ssp. edentula American Searocket (R)

Calandrinia breweri S. Watson Brewer Calandrinia (R) CNPS List 4

Calandrinia maritima Nutt. Seaside Redmaids (R) CNPS List 4

Californica macrophylla (H.& A.) Aldas., C. Navarro, P. Vargas, Ll. Saez & Aedo Largeleaf Filaree (R)

Callitriche marginata Torrey California Water-starwort, Wallow Starwort (R)

Calocedrus decurrens (Torrey) Florin Incense Cedar (U)

Calochortus catalinae S. Watson Catalina Mariposa Lily (U) CNPS List 4

Calochortus clavatus S. Watson ssp. clavatus Club-haired Mariposa Lily (U) CNPS List 4

Calochortus clavatus ssp. pallidus (Hoover) Munz Pale Yellow Mariposa Lily (R)

Calochortus invenustus E. Greene Plain Mariposa Lily (U)

Calochortus luteus Lindley Gold Nuggets (R)

Calochortus palmeri S. Watson var. palmeri Palmer Mariposa Lily (R) CNPS List 1B

Calochortus plummerae Greene Plummer Mariposa Lily (R) CNPS List 1B

Calochortus weedii var. vestus Purdy Weed Mariposa Lily (R) CNPS List 1B

Calyptridium monospermum Greene One-seeded Pussypaws (R)

Calyptridium parryi Gray var. parryi Parry Calyptridium (U)

Calyptridium umbellatum (Torrey) Greene Pussypaws (U)

Calystegia macrostegia ssp. amplissima Brummitt Island Morning-glory (R)

Calystegia malacophylla ssp. tomentella var. deltoidea (Greene) Munz Tehachapi Morning-glory (R)

Calystegia occidentalis ssp. fulcrata (Gray) Brummitt Western Morning-glory (R)

Calystegia occidentalis ssp. occidentalis var. tomentella (Greene) Brummitt Woolly Western Morning-glory (R)

Calystegia peirsonii (Abrams) Brummitt Peirson’s Morning-glory (R)

Calystegia sepium ssp. binghamiae (Greene) Brummitt Bingham Morning-glory (R) CNPS List 1A

Calystegia soldanella (L.) R. Br. Beach Morning-glory (U)

Camissonia brevipes (A. Gray) Raven ssp. brevipes Yellow Cups (R)

Camissonia campestris cf. ssp. obispoensis Raven San Luis Obispo Sun-cup (R)

Camissonia cheiranthifolia (Sprengel) Raim ssp. cheiranthifolia Beach Primrose (R)

Camissonia cheiranthifolia ssp. suffruticosa (S. Watson) Raven Beach Primrose (U)

Camissonia confusa Raven Confusing Primrose (R)

Camissonia graciliflora (Hooker & Arnott) Raven Hill Sun-cup (R)

Camissonia ignota (Jepson) Raven Small Primrose (U)

Camissonia luciae Raven Santa Lucia Sun-cup (R)

Camissonia micrantha (Sprengel) Raven Tiny Primrose (U)

Camissonia pallida (Abrams) Raven ssp. pallida Pale Primrose (R)

Camissonia palmeri (S. Watson) Raven Palmer Primrose (R)

Cardamine breweri S. Watson var. breweri Brewer’s Bitter-cress (R)

Cardamine oligosperma Torrey & Gray Few-seeded Bitter-cress (R)

Cardamine pachystigma (S. Watson) Rollins var. pachystigma Toothwort (R)

Cardionema ramosissimum (Weinm.) A. Mels. & J.F. Macbr. Sand Mat (R)

Carex abrupta Mackenzie Abrupt-beaked Sedge (R)

Carex alma L. Bailey Sturdy Sedge (U)

Carex athrostachya Olney Slender-beaked Sedge (R)

Carex aurea Nuttall Golden-fruited Sedge (R)

Carex barbarae Dewey Santa Barbara Sedge (R)

Carex bolanderi Olney Bolander Sedge (R)

Carex brainerdii Mack. Brainerd Sedge (R)

Carex densa L. Bailey Dense Sedge (R)

Carex douglasii Boott Douglas Sedge (R)

Carex filifolia var. erostrata Kük. Short-grass Sedge (R)

Carex fracta Mackenzie Fragile-sheathed Sedge (R)

Carex globosa Boott Round-fruited Sedge (R)

Carex hassei L. Bailey Hasse Sedge (R)

Carex lanuginosa Michaux Woolly Sedge (R)

Scientific Name Common Name

Carex multicaulis L. Bailey Many-stemmed Sedge (R)

Carex nebrascensis Dewey Nebraska Sedge (R)

Carex pansa L. Bailey Sand Dune Sedge (R)

Carex subfusca W. Boott Brown Sedge (U)

Carex triquetra Boott Triangluar-fruited Sedge (R)

Castilleja angustifolia (Nuttall) G. Don Desert Indian Paintbrush (R)

Castilleja applegatei ssp. disticha (Eastw.) Chuang & Heckard Eastwood Indian Paintbrush (R)

Castilleja applegatei ssp. pinetorum (Fern.) Chuang & Heckard Wavyleaf Indian Paintbrush (R)

Castilleja attenuata (Gray) Chuang & Heckard Valley Tassels (R)

Castilleja densiflora (Benth.) Chuang & Heckard ssp. densiflora Dense-flowered Owl's Clover (R)

Castilleja gyroloba Pennell Indian Paintbrush (R, Type)

Castilleja lanata ssp. hololeuca (Greene) Chuang & Heckard White-felted Indian Paintbrush (R)

Castilleja linariifolia Benth. Linaria-leaved Indian Paintbrush (R)

Castilleja miniata Hook. ssp. miniata Great Red Indian Paintbrush (R)

Castilleja minor (A. Gray) A. Gray ssp. minor Annual Indian Paintbrush (R)

Castilleja minor ssp. spiralis (Jeps.) Chuang & Heckard Large-flowered Annual Indian Paintbrush (R)

Castilleja mollis Pennell Soft-leaved Indian Paintbrush (R)

Castilleja subinclusa ssp. franciscana (Pennell) Chuang & Heckard San Francisco Long-leaved Indian Paintbrush (R)

Caulanthus amplexicaulis S. Watson var. amplexicaulis Clasping-leaved Jewelflower (R)

Caulanthus anceps Payson Lemmon Mustard (R)

Caulanthus californicus (S. Watson) Payson California Jewelflower (R) Fed-Endangered

Caulanthus coulteri var. lemmonii (S. Watson) Munz Lemmon Jewelflower (R)

Caulanthus heterophyllus (Nutt.) Payson var. heterophyllus Different-leaved Jewelflower (R)

Caulanthus inflatus S. Watson Desert Candle (R)

Ceanothus dentatus T. & G. Dentate Ceanothus (R)

Ceanothus greggii ssp. vestitus (Greene) McMinn Mojave Ceanothus (U)

Ceanothus megacarpus var. insularis (Eastw.) Munz Island Ceanothus (R)

Ceanothus megacarpus var. pendulous McMinn Pendulous Bigpod Ceanothus (R)

Ceanothus oliganthus var. sorediatus (Hook. & Arn.) Hoover Jim Brush (R)

Ceanothus palmeri Trel. Palmer Ceanothus (U)

Ceanothus papillosus T. & G. ssp. papillosus Wartleaf Ceanothus (U)

Ceanothus papillosus ssp. roweanus McMinn Wartleaf Ceanothus (R)

Ceanothus tomentosus var. olivaceous Jepson Woollyleaf Ceanothus (R)

Celtis reticulata Torrey Netleaf Hackberry (R)

Centaurium exaltatum (Griseb.) W. Wright ex Piper Great Basin Centaury (U)

Centaurium venustum (A. Gray) B.L. Robins. ssp. venustum Beautiful Centaury, Canchalagua (R)

Centromadia parryi ssp. australis (Keck) B.G. Baldwin Southern Tarplant (R)

Centrostegia thurberi var. macrotheca Thurber Spineflower (R)

Ceratophyllum demersum L. Hornwort, Coontail (R)

Cercocarpus betuloides var. blancheae (C. Schneider) Little Island Mountain Mahogany (R)

Cercocarpus ledifolius var. intermontanus N. Holmgren Cut-leaved Mountain Mahogany (U)

Cercocarpus ledifolius Nuttall var. ledifolius Mountain Mahogany (R)

Chaenactis artemisiifolia (Gray) Gray White Pincushion (U)

Chaenactis fremontii A. Gray Desert Pincushion (R)

Chaenactis glabriuscula var. heterocarpha (A. Gray) H.M. Hall Different-seeded Yellow Pincushion (R)

Chaenactis glabriuscula var. lanosa (DC.) H.M. Hall Woolly Yellow Pincushion (U)

Chaenactis glabriuscula var. megacephala A. Gray Big-flowered Yellow Pincushion (R)

Chaenactis glabriuscula var. orcuttiana (Greene) H.M. Hall Woolly Yellow Pincushion (R) CNPS List 1B

Chaenactis stevioides Hook. & Arn. Desert Pincushion (R)

Chaenactis xantiana Gray Xantus Pincushion (U)

Chamaescyce micromera (Engelm.) Wooton & Standl. Sonoran Sandmat (R)

Chamaesyce ocellata (Durand & Hilg.) Millsp. ssp. ocellata Littleye Spurge (R)

Chamaesyce polycarpa var. hirtella (Boiss.) Parish Hairy Golondrina (R)

Chamaesyce polycarpa (Benth.) Millsp. Golondrina (R)

Chamaesyce serpens (Kunth) Small Matted Sandmat (R)

Chamaesyce serpyllifolia (Pers.) Small ssp. serpyllifolia Thyme-leaved Spurge (R)

Scientific Name Common Name

Cheilanthes clevelandii D.C. Eaton. Cleveland Lip-fern (R)

Cheilanthes cooperae D.C. Eaton Mrs. Cooper Lip-fern (R)

Cheilanthes newberryi (D.C. Eaton) Domin Cotton Fern (R)

Chenopodium atrovirens Rydb. Pigweed (R)

Chenopodium fremontii S. Watson Fremont Goosefoot (U)

Chenopodium pratericola Rydb. Narrow-leaved Goosefoot (R)

Chorizanthe blakleyi Hardham Blakley’s Spineflower (R)

Chorizanthe clevelandii C. Parry Cleveland Spineflower (R)

Chorizanthe douglasii Benth. Douglas Spineflower (R)

Chorizanthe membranacea Benth. Pink Spineflower (R)

Chorizanthe parryi var. fernandina (S. Watson) Jepson San Fernando Valley Spineflower (R) Endangered

Chorizanthe procumbens Nutt. Prostrate Spineflower (R)

Chorizanthe staticoides forma bracteata Goodman Bracted Turkish Rugging (R, Type)

Chorizanthe uniaristata T. & G. One-awned Spineflower (R)

Chrysothamnus nauseosus ssp. = Ericameria nauseosa var. taxonomic revisions

Chrysothamnus viscidiflorus (Hook.) Nutt. ssp. viscidiflorus Yellow Rabbitbrush (R)

Cicuta douglasii (DC.) Coulter & Rose Western Water-hemlock (R)

Cirsium brevistylum Cronq. Indian Thistle (R)

Cirsium occidentale var. venustum (E. Greene) Jepson Red or Venus Thistle (U)

Cirsium scariosum Nuttall Elk Thistle (R)

Clarkia affinis Lewis & Lewis Hairy Clarkia (R)

Clarkia cylindrica (Jepson) H. Lewis & M. Lewis ssp. cylindrica Cylindrical Godetia (R)

Clarkia cylindrica ssp. clavicarpa W. Davis Cylindrical Godetia (R)

Clarkia dudleyana (Abrams) J.F. Macbr. Dudley Godetia (R)

Clarkia modesta Jeps. Modest Clarkia (R)

Clarkia purpurea ssp. viminea (Douglas) Lewis & Lewis Large Purple Clarkia (R)

Clarkia rhomboidea Douglas Rhomboid Clarkia (U)

Clarkia xantiana Gray ssp. xantiana Xantus Clarkia (R)

Claytonia exigua T. & G. ssp. exigua Small Miner's Lettuce (U)

Claytonia parviflora Hook. ssp. parviflora Small-flowered Miner's Lettuce (U)

Claytonia parviflora ssp. viridis (Davidson) J.M. Miller & Chambers Green Small-flowered Miner's Lettuce (R)

Claytonia rubra (J.T. Howell) Tidestrom ssp. rubra Red Miner's Lettuce (U)

Collinsia bartsiifolia var. davidsonii (Parish) V. Newsom Davidson White Chinese Houses (R)

Collinsia childii A. Gray Child Blue-eyed Mary (R)

Collinsia parryi A. Gray Parry Blue-eyed Mary (R)

Collinsia parviflora Lindley Blue-eyed Mary, Blue Lips (R)

Collinsia torreyi var. wrightii (S. Watson) I.M. Johnston Wright Blue-eyed Mary (U)

Collomia grandiflora Lindley Large-flowered Collomia (U)

Collomia tinctoria Kellogg Yellow-staining Collomia (R)

Comarostaphylis diversifolia ssp. planifolia (Jeps.) G. Wallace Simpleleaf Summer Holly (R)

Convolvulus simulans Perry Small-flowered Morning-glory (R)

Conyza coulteri Gray Coulter Horseweed (R)

Cordylanthus maritimus Benth. ssp. maritimus Saltmarsh Birds-beak (R) Listed E

Cordylanthus rigidus ssp. setiferus Chuang & Heckard Dark-tipped Rigid Bird’s-Beak (U)

Coreopsis calliopsidea (DC.) A. Gray Leafy-stemmed Coreopsis (R)

Cornus glabrata Bentham Brown Dogwood (R)

Cornus sericea L. ssp. sericea American or Creek Dogwood (R)

Crassula aquatica (L.) Schönl. Water Pigmy-Weed (R)

Crepis acuminata Nuttall Long-leaved Hawksbeard (R)

Crepis occidentalis Nuttall ssp. occidentalis Western Hawksbeard (U)

Crepis occidentalis ssp. pumila (Rydb.) Babcock & Stebbins Western Hawksbeard (R)

Cressa truxillensis Kunth var. truxillensis Spreading Alkali-Weed (U)

Cryptantha barbigera (A. Gray) E. Greene Bearded Forget-Me-Not (R)

Cryptantha corollata (I.M. Johnston) I.M. Johnston Crowned Forget-Met-Not (R, Type)

Cryptantha decipiens (M.E. Jones) A.A.Heller Gravel Forget-Me-Not (R)

Cryptantha echinella E. Greene Prickly Forget-Me-Not (U)

Scientific Name Common Name

Cryptantha flaccida (Lehm.) E. Greene Flaccid Forget-Me-Not (R)

Cryptantha leiocarpa (Fischer & C. Meyer) E. Greene Coast Forget-Me-Not (R)

Cryptantha maritima (Greene) Greene Seaside Forget-Me-Not (R)

Cryptantha micrantha (Torrey) I.M. Johnston Eremocarya (R)

Cryptantha micromeres (A. Gray) E. Greene Minute-flowered Forget (R)

Cryptantha microstachys (A. Gray) E. Greene Tejon Forget-Me-Not (U)

Cryptantha mohavensis (Greene) Greene Mojave Forget-Me-Not (R)

Cryptantha nemaclada E. Greene Colusa Forget-Me-Not (U)

Cryptantha nevadensis A. Nelson & Kennedy var. nevadensis Nevada Forget-Me-Not (R)

Cryptantha nevadensis A. Nelson & Kennedy var. rigida Brand Rigid Nevada Forget-Me-Not (R)

Cryptantha oxygona (A. Gray) E. Greene) Sharp-not Forget-Me-Not (R)

Cryptantha simulans E. Greene Pine Forget-Me-Not (U)

Cryptantha torreyana (A. Gray) E. Greene Torrey Forget-Me-Knot (R)

Cryptantha traskiae I.M. Johnston Trask Forget-Me-Not (R)

Cuscuta californica var. breviflora Engelmann California Dodder (R)

Cuscuta campestris Yuncker Western Field Dodder (R)

Cuscuta denticulata Engelmann Desert Dodder (R)

Cuscuta indecora Choisy var. indecora Pretty Dodder (R)

Cuscuta indecora var. neuropetala (Engelmann) Hitchc. Pretty Dodder (R)

Cuscuta salina var. major Yuncker Saltmarsh Dodder (U)

Cycladenia humilis var. venusta (Eastwood) Munz Elegant Cycladenia (R)

Cyperus acuminatus Torrey & Hook. Short-pointed Umbrella-sedge (R)

Cyperus erythrorhizos Muhlenb. Red-root Flatsedge (R)

Cyperus laevigatus L. Smooth Flatsedge (R)

Cyperus odoratus L. Flatsedge (R)

Cyperus squarrosus L. Awned Flatsedge (R)

Cystopteris fragilis (L.) Bernhardi Brittle or Fragile Fern (R)

Deinandra clementina (Brandegee) B.G. Baldwin Island or Catalina Tarplant (R)

Deinandra kelloggii (E. Greene) E. Greene Kellogg Tarplant (R)

Deinandra minthornii (Jepson) B.G. Baldwin Santa Susana Tarplant (R, Type) Listed R

Delphinium gracilentum Greene Coast Larkspur (R)

Delphinium gypsophilum Ewan ssp. gypsophilum Gypsum Larkspur (R) CNPS List 4

Delphinium inopinum (Jeps.) H.F. Lewis & Epling Unexpected Larkspur (R) CNPS List 1B

Delphinium parryi ssp. blochmaniae (Greene) F.H. Lewis & Epling Dune Larkspur (R) CNPS List 1B

Delphinium parryi ssp. maritimum (Davidson) M.J. Warnock Maritime Larkspur (R)

Delphinium parryi ssp. purpureum (F. Lewis & Epling) M.J. Warnock Mount Pinos Larkspur (U) CNPS List 4

Delphinium patens ssp. hepaticoideum Ewan Spreading Larkspur (R)

Delphinium patens ssp. montanum (Munz) Ewan Mountain Spreading Larkspur (R)

Delphinium umbraculorum F.H. Lewis & Epling Umbrella Larkspur (R) CNPS List 1B

Deschampsia cespitosa (L.) Beauv. ssp. cespitosa Tufted Hairgrass (R)

Deschampsia danthanoides (Trin.) Munro ex Bentham Annual Hairgrass (R)

Descurainia obtusa ssp. adenophora (Wooton & Standley) Detl. Desert Tansy Mustard (R)

Descurainia pinnata ssp. glabra (Wooton & Standl.) Detl. Naken Western Tansy Mustard (R)

Descurainia pinnata ssp. halicotorum (Cockerell) Detl. Western Tansy Mustard (R)

Descurainia pinnata ssp. menziesii (DC.) Detl. Menzies Tansy Mustard (U)

Dicentra ochroleuca Engelm. White Eardrops, Yellow Dicentra (R)

Dicentra pauciflora S. Watson Few-flowered Bleeding Heart (R)

Dichelostemma congestum (Sm.) Kunth Ookow (R)

Dichondra occidentalis House Western Dichondra (R) CNPS List 4

Dieteria [Machaeranthera] canescens (Pursh) Torrey ssp. canescens Hoary-Aster (U)

Dithyrea maritima (A. Davids.) Davidson Beach Spectacle-pod (R)

Dodecatheon alpinum (A. Gray) E. Greene Alpine Shooting Star (R)

Dodecatheon clevelandii ssp. insulare H.L. Thompson Island Shooting Star (R)

Dodecatheon clevelandii ssp. patulum (Greene) Thompson Lowland Padre Shooting Star (R)

Dodecatheon clevelandii ssp. sanctarum (E. Greene) Abrams Cleveland Shooting Star (U)

Downingia bella Hoover Hoover Downingia (R)

Scientific Name Common Name

Downingia pulchella (Lindl.) Torrey Flat-face Downingia (R)

Draba cuneifolia T. & G. Wedgeleaf Draba (R)

Draba verna L. Vernal Whitlow-grass (R)

Dudleya abramsii ssp. parva (Rose & Davids.) J. Bartel Conejo Live-forever (R) Listed T

Dudleya blochmaniae (Eastw.) Moran ssp. blochmaniae Blochman Live-forever (R) CNPS List 1B

Dudleya caespitosa (Haw.) Britt. & Rose Sea Lettuce (R)

Dudleya cymosa ssp. marcescens Moran Marcescent Live-forever (R, Type) Listed T

Dudleya cymosa ssp. ovatifolia (Britt.) Moran Santa Monica Mtns. Live-forever (R) Listed T

Dudleya cymosa ssp. pumila (Rose) K. Nakai Pygmy Live-forever (U)

Dudleya farinosa (Lindley) Britt. & Rose Farinose Live-forever (R)

Dudleya pulverulenta ssp. arizonica (Rose) Moran Chalky Live-forever (R)

Dudleya verityi N. Nakai Verity Live-forever (R) Listed T

Dudleya virens (Rose) Moran Bright Green Live-forever (R)

Eastwoodia elegans Brandegee Yellow Mock Aster (R)

Echinochloa crus-pavonis (Kunth) Shultes Gulf Barnyard Grass (R)

Echinodorus berteroi (Spreng.) Fassett Bur Head (R)

Eclipta prostrata (L.) L. False Daisy (R)

Elatine brachysperma Gray Slender Waterwort (R)

Elatine californica Gray California Waterwort (R)

Eleocharis acicularis (L.) Roemer & Schultes var. acicularis Slender Spike-rush (U)

Eleocharis bernardina Munz & Johnston Few-flowered Club-rush (R)

Eleocharis montevidensis Kunth Sand Spike-rush (R)

Eleocharis rostellata (Torrey) Torrey Beaked Spike-rush (R)

Eleocharis suksdorfiana Beauv. Suksdorf’s Spike-rush (R)

Elodea canadensis Rich. Common Waterweed (R)

Elymus glaucus ssp. jepsonii (Burtt Davy) Gould Jepson Blue or Woodland Wildrye (R)

Elymus stebbinsii (Scribner & J.G. Smith) Gould Wheatgrass (R)

Elymus trachycaulus ssp. subsecundus (Link) Gould Slender Wheatgrass (R)

Elymus trachycaulus (Link) Shinn. ssp. trachycaulus Slender Wheatgrass (R)

Emmenanthe penduliflora var. rosea Brand Rose Whispering Bells (R)

Encelia actoni Elmer Acton Brittlebush (U)

Encelia farinosa Torrey & A. Gray Brittlebush, Incienso (R)

Encelia frutescens (Gray) Gray Brittlebush, Incienso (R)

Encelia virginiensis Nelson Brittlebush (R)

Enemion occidentale (H. & A.) J.R. Drummond & Hutchinson Western Meadow-rue (R)

Ephedra californica S. Watson California Desert Tea, Cañatillo (R)

Ephedra nevadensis S. Watson Nevada Ephedra or Mormon-tea (R)

Epilobium brachycarpum C. Presl Panicled Willow-herb (U)

Epilobium canum ssp. latifolium (Hook.) Raven Broad-leaved California Fuchsia (U)

Epilobium ciliatum ssp. glandulosum (Lehm.) P. Hoch & Raven Sticky Northern Willow-herb (R)

Epilobium densiflorum (Lindley) P. Hoch & Raven Dense-flowered Spike-primrose (R)

Epilobium foliosum (T.& G.) Suksd. Leafy Spike-primrose (R)

Epilobium glaberrinum Barbey ssp. glaberrinum Waxy Willow-herb (R)

Epilobium oregonense Hausskn. Oregon Spike-primrose (R)

Epilobium pygmaeum (Speg.) P. Hoch & Raven Smooth Spike-primrose (R)

Epilobium torreyi (S. Watson) P. Hoch & Raven Brook Spike-primrose (R)

Epipactis gigantea Hook. Stream Orchid (U)

Equisetum arvense L. Common or Field Horsetail (U)

Equisetum Xferrissii Clute Ferris Horsetail (R)

Equisetum hyemale var. affine (Engelm.) Calder & R.L. Taylor Common or Giant Scouring Rush (U)

Equisetum telmateia ssp. braunii (Milde) R.L. Hauke Giant Horsetail (U)

Eragrostis mexicana (Hornem.) Link ssp. mexicana Mexican Lovegrass (R)

Eragrostis mexicana var. virescens (C. Presl) Koch & E. Sanchez Orcutt Lovegrass (R)

Eragrostis pectinacea (Michx.) Nees var. pectinacea Tufted Lovegrass (R)

Eremalche parryi (E. Greene) E. Greene ssp. parryi Parry Mallow (R)

Eriastrum densifolium (Benth.) Mason ssp. densifolium Woolly Star (R)

Scientific Name Common Name

Eriastrum densifolium ssp. mohavensis (Craig) H. Mason Mojave Woolly Star (R)

Eriastrum eremicum (Jeps.) H. Mason ssp. eremicum Woolly Star (R)

Eriastrum hooveri (Jepson) H. Mason Hoover Woolly Star (R) CNPS List 4

Eriastrum pluriflorum (A.A. Heller) H. Mason Woolly Star (R)

Ericameria arborescens (A. Gray) E. Greene Golden-fleece (R)

Ericameria cooperi (Gray) H.M. Hall var. cooperi Cooper Goldenbush (R)

Ericameria cuneata (Gray) McClatchie var. cuneata Wedgeleaf Goldenbush (U)

Ericameria cuneata var. spathulata (A. Gray) H.M. Hall Spatulate-leaved Goldenbush (R)

Ericameria ericoides (Less.) Jeps. ssp. ericoides Heatherleaf Goldenbush (U)

Ericameria nauseosa var. speciosa (Nutt.) Nesom & Baird White-stemmed Rubber Rabbitbrush (R)

Ericameria nauseosa var. bernardina (Hall) Nesom & Baird San Bernardino Rubber Rabbitbrush (R)

Ericameria nauseosa var. oreophila (Greene) Nesom & Baird Common Rubber Rabbitbrush (U)

Ericameria parryi var. aspera (Greene) G.L. Newson & G.I. Baird Parry Rabbitbrush (R)

Ericameria teretifolia (Durand & Hilg.) Jepson Round-leaved Rabbitbrush (R)

Ericameria palmeri var. pachylepis (H.M. Hall) Nesom Palmer Goldenbush (R)

Ericameria pinifolia (Gray) H.M. Hall Pine Goldenbush (R)

Erigeron breweri var. covillei (Greene) G. Neswom Fleabane Daisy (R)

Erigeron glaucus Ker-Gawler Seaside Daisy (R)

Eriodictyon californicum (Hooker & Arnott) Torrey California Yerba Santa (R)

Eriodictyon crassifolium Bentham var. crassifolium Thickleaf Yerba Santa (U)

Eriodictyon traskiae Eastw. Trask Yerba Santa (R)

Eriodictyon trichocalyx A.A. Heller var. trichocalyx Yerba Santa (U)

Eriogonum arborescens Greene Arborescent Buckwheat (U)

Eriogonum covilleanum Eastw. Coville Buckwheat (R)

Eriogonum crocatum Davidson Conejo or Saffron Buckwheat (R, Type)

Eriogonum deflexum var. baratum (Elmer) Reveal Flat-crown Buckwheat (R, Type)

Eriogonum elegans Greene Elegant Buckwheat (R)

Eriogonum gracillimum S. Watson Slender Buckwheat (R)

Eriogonum grande Greene var. grande Island Buckwheat (U)

Eriogonum grande Greene var. rubescens Munz Red Island Buckwheat (U)

Eriogonum grande Greene var. timorum Reveal San Nicolas Island Buckwheat (U)

Eriogonum heermannii Durand & Hilg. var. heermannii Heerman Buckwheat (U)

Eriogonum hirtiflorum S. Watson Hairy-flowered Buckwheat (U)

Eriogonum hooveri (Reveal) Reveal Hoover’s Little Trumpet (U)

Eriogonum inerme (S. Watson) Jeps. Unarmed Buckwheat (U)

Eriogonum kennedyi ssp. alpigenum (Munz & Johnston) Munz & Johnston Alpine Kennedy Buckwheat (R) CNPS List 1B

Eriogonum kennedyi var. austromontanum Munz & I.M. Johnston Southern Mountain Buckwheat (R) CNPS List 1B

Eriogonum latifolium Smith Coast Buckwheat, Tibinagua (R)

Eriogonum maculatum A.A. Heller Spotted Buckwheat (U)

Eriogonum molestum Greene Pine Buckwheat (U)

Eriogonum nudum var. westonii (S. Stokes) J.T. Howell Weston Barestem Buckwheat (U)

Eriogonum nudum var. pubiflorum Benth. Hairy-flowered Barestem Buckwheat (U)

Eriogonum ordii S. Watson Ord Buckwheat (U)

Eriogonum parvifolium var. paynei (Wolf ex Munz) Reveal Payne Dune Buckwheat (U, Type)

Eriogonum roseum Durand & Hilg. Rose Buckwheat (U)

Eriogonum saxatile S. Watson Rock Buckwheat (U)

Eriogonum spergulinum ssp. reddingianum (Jones) J.T. Howell Spurry Buckwheat (R)

Eriogonum thurberi Torrey Thurber’s Wild Buckwheat (R)

Eriogonum trichopes Torrey var. trichopes Little Trumpet (U)

Eriogonum umbellatum var. bahiiforme (T. & G.) Jepson Sulphur-flower Buckwheat (R)

Eriogonum umbellatum var. furcosum Reveal Sulphur Buckwheat (R)

Eriogonum umbellatum var. subaridum S. Stokes Sulphur Buckwheat (R)

Eriogonum vimineum Benth. Wicker Buckwheat (R)

Eriogonum viridescens A. Heller Green Buckwheat (U)

Eriogonum wrightii var. membranaceum Jeps. Sheathed Wright Buckwheat (R)

Eriogonum wrightii var. trachygonum (Torr. ex Benth.) Jeps. Rough-node Bastardsage (R)

Scientific Name Common Name

Eriophyllum confertiflorum var. tanacetiflorum (E. Greene) Jepson Tansy-leaved Woolly Yarrow (R) CNPS 4.2

Eriophyllum jepsonii Greene Jepson Woolly Yarrow (R)

Eriophyllum staechadifolium Lagasca Seaside Woolly Sunflower (U)

Eryngium vaseyi J. Coulter & Rose Coyote Thistle or Button-celery (R)

Erysimum insulare Greene ssp. insulare Island Wallflower (U)

Erysimum insulare ssp. suffrutescens (Abrams) R.A. Price Island Wallflower (R)

Eschscholzia hypecoides Bentham Gypsum Poppy (R)

Eschscholzia lemmonii Greene ssp. lemmonii Lemmon Poppy (R) CNPS List 4

Eschscholzia minutiflora S. Watson Tiny-flowered Poppy (R)

Eschscholzia ramosa (Greene) Greene Island Poppy (R)

Euphorbia palmeri S. Watson var. palmeri Wood Spurge (R)

Euphorbia spathulata Lam. Spurge (R)

Festuca rubra L. Red Fescue (R)

Fimbristylis thermalis S. Watson Hot-Springs Fimbristylis (R)

Forestiera pubescens Nutt. Desert Olive, Dwarf Swamp Privet (R)

Fraxinus velutina Torrey Velvet or Arizona Ash (R)

Fritillaria agrestis E. Greene Stink Bells (R) CNPS List 4

Fritillaria biflora Lindley var. biflora Chocolate Lily, Mission Bells (U)

Fritillaria ojaiensis A. Davidson Ojai Fritillary (R, Type) CNPS List 1B

Fritillaria pinetorum A. Davidson Pine Fritillary (R)

Galium angustifolium ssp. foliosum (Hilend & Howell) Dempster & Stebb. Channel Islands Bedstraw (R, Type)

Galium bifolium S. Watson Low Mountain Bedstraw (R)

Galium californicum Hooker & Arnott ssp. californicum California Bedstraw (R)

Galium cliftonsmithii (Dempster) Dempster & Stebb. Santa Barbara Bedstraw (R, CNPS 4)

Galium trifidum var. pacificum Wiegand Coastal Bedstraw (R)

Galium triflorum Michaux Sweet-scented Bedstraw (R)

Gaura coccinea Pursh Wild Honeysuckle, Linda Tarde (R)

Gayophytum diffusum ssp. parviflorum H. Lewis & J. Szweykowski Diffuse Gayophytum (U)

Gayophytum heterozygum H. Lewis & J. Szweykowski Hybrid Gayophytum (R)

Gayophytum racemosum T. & G. Black-foot Gayophytum (R)

Geranium californicum G. Jones & F. Jones California Geranium (R)

Geranium viscosissimum Fischer & C. Meyer Sticky Cranesbill (R)

Gilia achilleifolia Benth. ssp. achilleifolia California or Yarrow-leaved Gilia (U)

Gilia achilleifolia Benth. ssp. multicaulis (Benth.) V. & A. Grant Many-stemmed California Gilia (R)

Gilia aliquanta A. D. Grant & V. E. Grant Puff-calyx Gilia (R)

Gilia australis (Mason & A. Grant) V. Grant & A. Grant Southern Gilia (R)

Gilia austro-occidentalis (A.D. & V.E. Grant) A.D. & V.E.Grant Southwestern Gilia (R)

Gilia brecciarum M.E. Jones ssp. brecciarum Breccia Gilia (R)

Gilia brecciarum ssp. jacens (A. Grant & V. Grant) Day Purple-flowered Breccia Gilia (R)

Gilia capillaris Kellogg Miniature or Smooth-leaved Gilia (R)

Gilia interior (Mason & A. Grant) A. Grant Slender-flowered Gilia (R)

Gilia latiflora ssp. cuyamensis A. & V. Grant Cuyama Gilia (U) CNPS List 4

Gilia latiflora ssp. davyi (Milliken) A. & V. Grant Davy Broad-flowered Gilia (R)

Gilia latiflora (Gray) Gray ssp. latiflora Broad-flowered Gilia (R)

Gilia leptantha ssp. pinetorum A. & V. Grant Gabriel Trumpet (U) CNPS List 4

Gilia malior A.G. Day & V.E. Grant Scrub Gilia (R)

Gilia minor A.D. Grant & V.E. Grant Little Gilia (U)

Gilia modocensis Eastwood Modoc Gilia (R)

Gilia nevinii Gray Nevin Gilia (U)

Gilia ochroleuca ssp. exilis (Gray) A.& V. Grant Volcanic Gilia (R)

Gilia ochroleuca M.E. Jones ssp. ochroleuca Volcanic Gilia (R)

Gilia sinuata Benth. Sinuate Gilia (R)

Gilia splendens H. Mason & A. Grant ssp. splendens Splendid Gilia (U)

Gilia tenuiflora Benth. ssp. tenuiflora Greater Yellowthroat Gilia (R)

Gilia tetrabreccia A. & V. Grant Mount Piños Gilia (U)

Gilia transmontana (H. Mason & A. Grant) A. & V. Grant Desert Gilia (U)

Scientific Name Common Name

Githopsis diffusa A. Gray ssp. diffusa Southern Bluecup (R)

Grindelia camporum var. bracteosum (J.T. Howell) M.A. Lane Bracted Gumplant (U)

Grindelia camporum E. Greene var. camporum Great Valley Gumplant (R)

Grindelia hirsutula Hook. & Arn. var. hirsutula Hirsute Gumplant (U, Type)

Grindelia stricta var. platyphylla (Greene) M.A. Lane Island Gumplant (R)

Grindelia Xlatifolia Kellogg ssp. latifolia Coastal Gumplant (R)

Gutierrezia sarothrae (Pursh) Britton & Rusby Broom Snakeweed, Matchweed (U)

Hazardia detonsa (Greene) Greene Island Goldenbush (U) CNPS 4

Helenium bigelovii Gray Bigelow Sneezeweed (U)

Helenium puberulum DC. Rosilla (U)

Helianthemum scoparium Nutt. Peak Rushrose (U)

Helianthus gracilentus Gray Wild Mountain or Slender Sunflower (R)

Hemizonella minima (Gray) Gray Hemizonella (U)

Hesperevax sparsiflora (A. Gray) E. Greene var. sparsiflora Few-leaved Evax (R)

Hesperochiron californicus (Benth.) S. Watson California Hesperochiron (R)

Hesperochiron pumilus (Griseb.) Porter Hesperochiron (R)

Hesperocnide tenella Torrey Western Nettle (R)

Hesperoyucca whipplei ssp. percursa Our Lord’s Candle (R)

Heterotheca psammophila B. Wagenkn. Camphor Weed (R)

Heterotheca sessiliflora ssp. camphorata (Eastw.) Semple Camphor Golden-Aster (R)

Heuchera abramsii Rydb. Abrams Alumroot (R)

Heuchera cespitosa Eastw. Alumroot (R)

Heuchera elegans Abrams Urn-flowered Alumroot (R)

Heuchera maxima Greene Island Alumroot (R)

Hieracium albiflorum Hooker White-flowered Hawkweed (R)

Hieracium argutum Nuttall Southern California Hawkweed (U)

Hieracium horridum Fries Shaggy or Woolly Hawkweed (R)

Hoffmannseggia glauca (Ortega) Eifert Pig-nut, Hog Potato (R)

Hoita orbicularis (Lindley) Rydb. Round-leaved Hoita (R)

Hollisteria lanata S. Watson Hollisteria (R)

Holocarpha heermannii (E. Greene) Keck Heermann Tarplant (R)

Holodiscus discolor (Pursh) Maxim. Oceanspray, Cream Bush (R)

Holodiscus microphyllus Rydb. var. macrophyllus Rock Spiraea (R)

Hordeum brachyantherum Nevski ssp. brachyantherum Meadow Barley (U)

Hordeum depressum (Scribner & J.G. Smith) Rydb. Low Barley (R)

Hordeum intercedens Nevski Vernal Barley (U)

Horkelia cuneata Lindley ssp. cuneata Wedgeleaf Horkelia (R)

Horkelia cuneata ssp. puberula (Greene) Keck Fuzzy Horkelia (R)

Horkelia rydbergii Elmer Rydberg Horkelia (U)

Hulsea heterochroma Gray Red-rayed Hulsea (R)

Hulsea vestita ssp. gabrielensis Wilken San Gabriel Hulsea (R)

Hutchinsia procumbens (L.) Desv. Desert Hutchinsia (U)

Hydrocotyle verticilata Thunb. Marsh Pennywort (R)

Hypericum formosum var. scouleri (Hook.) J. Coulter St. John’s Wort (R)

Imperata brevifolia Vasey Satintail (R)

Iris missouriensis Nuttall Western Blue Flag [Iris] (U)

Isocoma acradenia (E. Greene) E. Greene Desert Goldenbush (R)

Isolepis cernua (Vahl) Roemer & Schultes var. cernua Low Clubrush (R)

Isocoma menziesii var. sedoides (E. Greene) G. Nesom Coastal Goldenbush (U)

Isoëtes howellii Engelm. var. howellii Howell Quillwort (R)

Isoëtes howellii var. minima (A.A. Eaton) N.E. Pfeiffer Small Howell Quillwort (R)

Isoëtes nuttallii A. Braun Nuttall Quillwort (R)

Ivesia santolinoides A.Gray Mousetail Ivesia (R)

Ivesia saxosa (Greene) B. Ertter Five-finger Silverweed (R)

Jaumea carnosa (Less.) Gray Fleshy Jaumea (U)

Jensia yosemitana (Parry ex A. Gray) B.G. Baldwin Yosemite Tarplant (R)

Scientific Name Common Name

Jepsonia malvifolia (Greene) Small Island Jepsonia (R)

Juglans californica S. Watson var. californica Southern California Black Walnut (U) CNPS List 4

Juncus acutus ssp. leopoldii (Parl.) Snogerup Spiny Rush (U) CNPS List 4

Juncus arcticus ssp. vallicola (Rydb.) Lint Valley Baltic Rush (R)

Juncus balticus Willd. var. ater (Rydb.) Snogerup Rocky Mountain Rush (R)

Juncus bufonius L. var. bufonius Common Toad Rush (R)

Juncus bufonius var. occidentalis F.J. Hermann Western Toad Rush (R)

Juncus confusus Cov. Colorado Rush (R)

Juncus effusus ssp. pacificus (Fern. & Wieg.) H.L. Lint Pacific Rush (U)

Juncus ensifolius Wikström var. ensifolius Swordleaf or Three-stamen Rush (R)

Juncus macrandrus Cov. Long-anthered Rush (R)

Juncus macrophyllus Cov. Large-leaf Rush (U)

Juncus nevadensis S. Watson Sierra Rush (R)

Juncus occidentalis (Coville) Wiegand Western Rush (R)

Juncus oxymeris Engelm. Iris-leaved or Pointed Rush (R)

Juncus patens E. Meyer Spreading Rush (R)

Juncus phaeocephalus var. paniculatus Engelm. Brown-fruited Rush (R)

Juncus rugulosus Engelm. Wrinkled Rush (R)

Juncus textilis Buchenau Indian or Basket Rush (U)

Juncus torreyi Coville Torrey Rush (R)

Krascheninnikovia lanata (Pursh) A.D.J. Meeuse & Smit Winter Fat (R)

Lagophylla ramosissima Nutt. ssp. ramosissima Branched Lagophylla, Common Hareleaf (R)

Lastarriaea coriacea (Goodman) Hoover Lastarriaea (R)

Lasthenia coronaria (Nutt.) Ornduff Crown-pappus Goldfields (R)

Lasthenia ferrisiae Ornduff Ferris Goldfields (R)

Lasthenia glabrata ssp. coulteri (Gray) Ornduff Rayless Goldfields (R)

Lathyrus vestitus ssp. bolanderi (S. Watson) C. Hitchc. White-petaled Peavine (R)

Lathyrus vestitus ssp. laetiflorus (Greene) Broich Pacific Peavine (R)

Lathyrus vestitus ssp. laevicarpus Broich Pacific Peavine (U, Type)

Lavatera assurgentiflora Kellogg ssp. assurgentiflora Malva Rose (R)

Layia glandulosa ssp. lutea Keck Yellow Layia (U)

Layia glandulosa ssp. rosea Gray Rose Layia (R, Type)

Layia heterotricha (DC.) Hook. & Arn. Pale-yellow Layia (R) CNPS List 1B

Layia pentachaeata ssp. albida Keck White Tidy Tips (R)

Layia platyglossa (Fischer & C. Meyer) A. Gray Tidy Tips (U)

Lemna gibba L. Gibbose Duckweed (R)

Lemna minor L. Duckweed (R)

Lemna minuscula Herter Tiny Duckweed (R)

Lemna turionifera Landolt Duckweed (R)

Lemna valdiviana Philippi Big Duckweed (U)

Lepechinia calycina (Bentham) Epling Pitcher Sage (R)

Lepechinia fragrans (E. Greene) Epling Fragrant Pitcher Sage (R)

Lepechinia rossii S. Boyd & O. Mistretta Ross’ Pitcher Sage (R)

Lepidium campestre (L.) R. Br. Peppergrass (R)

Lepidium dictyotum A. Gray var. dictyotum Veiny Peppergras (R)

Lepidium dictyotum var. acutidens A. Gray Short-toothed Peppergrass

Lepidium lasiocarpum Nutt. var. lasiocarpum Hairy-pod Peppergrass (U)

Lepidium oblongum Small var. oblongum Oblong Peppergrass (U)

Lepidium strictum (S. Watson) Rattan Prostrate Peppergrass (R)

Lepidium virginicum var. pubescens (Greene) Thell. Hairy Poorman's Peppergrass (R)

Lepidium virginicum var. robinsonii (Thell.) C.L. Hitchc. Robinson’s Poorman's Peppergrass (R, CNPS 1B.2)

Leptodactylon pungens ssp. hallii (Parish) H. Mason Granite Prickly Phlox (R)

Leptodactylon pungens ssp. pulchriflorum (Brand) H. Mason Granite Prickly Phlox (U)

Leptosiphon androsaceus Bentham Baby Tears (R)

Leptosiphon bicolor Nuttall Bicolored Linanthus (R)

Leptosiphon breviculus (A. Gray) J.M. Porter & L.A. Johnson Short-stemmed Linanthus (R)

Scientific Name Common Name

Leptosiphon ciliatus (Benth.) Jepson Whisker Brush (R)

Leptosiphon liniflorus (Bentham) J.M. Porter & L.A. Johnson Narrow Flaxflower (U)

Leptosiphon nudatus (E. Greene) J.M. Porter & L.A. Johnson Tehachapi Linanthus or Flaxflower (R)

Leptosiphon pygmaeus ssp. continentalis (Raven) Porter & Johnson Continental Pygmy Linanthus (R)

Lessingia glandulifera var. peirsonii (J.T. Howell) Markos Peirson’s Lessingia (R) CNPS List 4

Lessingia pectinata var. tenuipes (J.T. Howell) Markos Sticky Lessingia (R)

Lessingia tenuis (Gray) Cov. Spring Lessingia (U, Type) CNPS List 4

Lewisia pygmaea (A. Gray) Robinson Pygmy Bitterroot (R)

Lewisia rediviva ssp. minor (Rydb.) Munz Small Bitterroot (U)

Leymus cinereus A. Löve Cespitose Wildrye (R)

Leymus Xhansenii Scribner Hansen’s Wildrye (R)

Lilium humboldtii ssp. ocellatum (Kellogg) Thorne Ocellated Humboldt Lily (U) CNPS List 4

Lilium pardalinum Kellogg ssp. pardalinum Leopard Lily (R)

Limonium californicum (Boiss.) A.A. Heller Marsh Rosemary (R)

Limosella acaulis Sesse & Mocino Tufted Mudwort (R)

Linanthus bigelovii (Gray) Greene Bigelow Linanthus (R)

Linanthus dianthiflorus (Benth.) Greene Ground Pink (U)

Linanthus parryae (Gray) Greene Parry Linanthus (R)

Linaria canadensis (L.) Dum.-Cours. var. canadensis Toadflax (R)

Linaria canadensis (L.) Dum.-Cours. var. texana (Scheele) Pennell Toadflax (U)

Linum lewisii Pursh Western Blue Flax (U)

Lipocarpha micrantha (M. Vahl.) G.C. Tucker Tiny Lipocarpha (R)

Lithocarpus densiflorus (Hook. & Arn.) Rehder Tanbark Oak (R)

Lithophragma bolanderi Gray Bolander Star (R)

Lithophragma cymbalaria T. & G. Mission Star (U)

Lithophragma heterophyllum (Hook. & Arn.) T. & G. Hill Star (R)

Lithophragma parviflorum (Hook.) T. & G. var. parviflorum Prairie Star (R)

Lobelia dunnii var. serrata (Gray) McVaugh Rothrock (Ojai) Lobelia (Type Locality only)

Loeflingia squarrosa Nuttall var. squarrosa California Loeflingia (R)

Loeseliastrum schottii S. Timbrook Schott Loeseliastrum (R)

Lomatium californicum (T. & G.) Mathias & Constance California Lomatium (R)

Lomatium caruifolium (H.& A.) J.M. Coult. & Rose var. caruifolium Alkali Desertparsley (R)

Lomatium dissectum var. multifidum (T.& G.) Mathias & Constance Carrotleaf Biscuitroot (R)

Lomatium insulare (Eastw.) Munz San Nicolas Island Lomatium (R)

Lomatium lucidum (T. & G.) Jeps. Shiny Lomatium (R)

Lomatium macrocarpum (T. & G.) J. Coulter & Rose Large-fruited Lomatium (R)

Lomatium mohavense (Coult. & Rose) Coult. & Rose ssp. mohavense Desert-parsley (U)

Lomatium parvifolium (Hook. & Arn.) Jeps. Small-leaved Lomatium (R)

Lomatium utriculatum (T. & G.) Coulter & Rose Foothill Lomatium (U)

Lonicera interrupta Benth. Chaparral Honeysuckle (U)

Lonicera subspicata Hooker & Arnott var. subspicata Santa Ynez Mountains Honeysuckle (R)

Lotus argophyllus ssp. argenteus Dunkle Silver Deervetch (R)

Lotus argophyllus ssp. nivius (E. Greene) Ottley Santa Cruz Island Silverhosackia (R)

Lotus crassifolius (Benth.) Greene var. crassifolius Broad-leaved Hosackia (U)

Lotus dendroideus (Greene) Greene var. dendroideus Island Broom (R)

Lotus dendroideus var. veatchii (Greene) Isley San Miguel Island Deerweed (R)

Lotus hamatus Greene Grab Hosackia or Lotus (R)

Lotus heermanii (Durand & Hilg.) Greene var. heermanii Heerman Lotus or Hosackia (R)

Lotus heermanii var. orbicularis (Gray) Isley Heerman Lotus (R)

Lotus junceus (Benth.) Greene Lotus (R)

Lotus micranthus Benth. Tiny Lotus (R)

Lotus nevadensis (S. Watson) Greene var. davidsonii (Greene) Isley Suphur-flowered Hosackia (U)

Lotus nevadensis (S. Watson) Greene var. nevadensis Sierra Nevada Hosackia (R)

Lotus nuttallianus E. Greene Nuttall’s Lotus (R)

Lotus oblongifolius (Benth.) Greene var. cupreus (Greene) Ottley Stream Trefoil (R)

Lotus oblongifolius (Benth.) Greene var. oblongifolius Narrow-leaved Hosackia, Stream Trefoil (U)

Scientific Name Common Name

Lotus scoparius var. brevialatus Ottley Deerweed (R)

Lotus stipularis (Benth.) Greene var. stipularis Balsam Lotus (R)

Ludwigia palustris (L.) Elliot Streamside Water Primrose (R)

Ludwigia peploides (Kunth) Raven ssp. peploides Floating Seedbox (R)

Lupinus adsurgens E. Drew var. adsurgens Silky Lupine (R)

Lupinus adsurgens var. undulatus C.P. Smith Wavyleaf Silky Lupine (R)

Lupinus agardhianus Heller Lupine (R)

Lupinus albicaulis Hooker Whitestem Lupine (R)

Lupinus albifrons var. douglasii (Agardh) C.P. Smith Island Silver Bush Lupine (R)

Lupinus andersonii S. Watson Anderson Lupine (R)

Lupinus arboreus Sims Yellow Bush Lupine (U)

Lupinus benthamii Sims Spider Lupine (R)

Lupinus breweri Gray var. breweri Brewer Mat Lupine (U)

Lupinus breweri var. bryoides C.P. Smith Alpine Brewer Lupine (U)

Lupinus chamissonis Eschsch. Coastal Bush Lupine (R)

Lupinus concinnus spp. optatus D. Dunn Bajada Lupine (R)

Lupinus concinnus spp. orcutti (S. Watson) D. Dunn Orcutt Bajada Lupine (R)

Lupinus excubitus M.E. Jones var. excubitus Grape Soda Lupine (U)

Lupinus excubitus var. austromontanus (A.A. Heller) C.P. Smith Southern Mountain Bush Lupine (U)

Lupinus excubitus var. johnstonii C.P. Smith Johnston Bush Lupine (R)

Lupinus formosus var. robustus C.P. Smith Summer Bush Lupine (R)

Lupinus latifolius J. Agardh var. latifolius Broad-leaved Lupine (R)

Lupinus latifolius var. parishii C.P. Smith Parish Broad-leaved Lupine (U)

Lupinus lepidus var. confertus (Kellogg) C.P. Smith Prairie Lupine (U)

Lupinus luteolus Kellogg Butter Lupine (U)

Lupinus microcarpus var. densiflorus (Benth) Jeps. Densely Red-flowered Lupine (R)

Lupinus microcarpus var. horizontalus (A.A. Heller) Jeps. Prostrate Red-flowered Lupine (U, Type)

Lupinus nanus Benth. Small Lupine (R)

Lupinus polyphyllus Lindley var. burkei Large-leaved Lupine (R)

Lycium andersonii Gray Anderson Desert-thorn (R)

Lycium californicum Nuttall ex Gray California Desert-thorn (R)

Lycium verrucosum Eastwood San Nicolas Island Desert-thorn (R, Type)

Lythrum californicum T. & G. California Loosestrife (R)

Madia elegans ssp. vernalis Keck Vernal Tarplant or Madia (R)

Madia elegans ssp. wheeleri (Gray) Keck Wheeler Tarplant or Madia (R)

Madia exigua (Smith) A. Gray Small or Threadstem Tarplant or Madia (R)

Madia sativa Molina Coast Tarplant (R)

Maianthermum racemosum ssp. amplexicaule (Nutt.) LaFrankie False Solomon’s Seal, Wild Lily of the Valley (R)

Maianthermum stellatum (L.) Link False Solomon’s Seal, Wild Lily of the Valley (R)

Malacothamnus fasciculatus var. laxiflorus (Gray) Kearney Lax-flowered Bushmallow (R)

Malacothamnus fremontii (Torrey ex Gray) Torrey ex. Greene Fremont Bushmallow (U)

Malacothamnus marrubioides (D. & H.) Greene Pink-flowered Bush[Globe]mallow (U)

Malacothamnus nuttallii Abrams Nuttall Bushmallow (Type)

Malacothrix californica DC. var. californica California Cliff-aster (U)

Malacothrix clevelandii Gray Cleveland Cliff-aster (R)

Malacothrix floccifera (DC.) Blake Woolly or Flocose Dandelion (R)

Malacothrix foliosa ssp. crispifolia W.S. Davis Leafy Cliff-aster (R)

Malacothrix foliosa Gray ssp. foliosa Leafy Cliff-aster (R)

Malacothrix foliosa ssp. polycephala W.S. David Many-headed Leafy Cliff-aster (R)

Malacothrix glabrata A. Gray Desert Dandelion (R)

Malacothrix incana (Nuttall) Torrey & A. Gray var. incana Dunedelion (U) CNPS List 4

Malacothrix junakii W.S. Davis Junak Dandelion (R, Type)

Malacothrix phaeocarpa W.S. Davis Brown-fruited Dandelion (R) CNPS List 4

Malacothrix saxatilis (Nuttall) T. & G. var. saxatilis Cliff-aster (U)

Malacothrix saxatilis var. altissima (Greene) Ferris Cliff-aster (R)

Malacothrix saxatilis var. commutata Ferris Cliff-aster (U)

Scientific Name Common Name

Malacothrix saxatilis var. implicata (Eastw.) Hall Implicated Cliff-aster (U, Type)

Malacothrix similis Davis & Raven Mexican Cliff-aster (R)

Malacothrix squalida Greene Island Dandelion (R)

Malvella leprosa (Ortega) Krapov Alkali-mallow, White-Weed (U)

Marah macrocarpus var. major (Dunn) Stocking Island Man-root (R)

Marsilea vestita Hooker & Greville ssp. vestita Hairy Pepperwort, Clover Fern (R)

Meconella denticulata E. Greene Tiny Poppy (R)

Melica californica Scribner var. californica California Melic Grass (R)

Melica frutescens Scribner Melic Grass (R)

Melica stricta Bolander var. albicaulis Whitestem Rock Melic Grass (R)

Melica stricta Bolander var. stricta Nodding or Rock Melic Grass (R)

Mentha arvensis L. Field Mint (R)

Mentzelia affinis Greene Stickleaf (R)

Mentzelia albicaulis (Hook.) T. & G. Whitestem Stickleaf (R)

Mentzelia congesta (Nuttall) T. & G. var. congesta Congested Stickleaf (U)

Mentzelia congesta var. davidsoniana (Abrams) J.F. Macbr. Ventana Stickleaf (R)

Mentzelia dispersa S. Watson Scattered Stickleaf (R)

Mentzelia gracilenta T. & G. Slender Stickleaf (R)

Mentzelia micrantha (Hook. & Arnott) T. & G. Tiny-flowered Stickleaf (U)

Mentzelia pectinata Kellogg Stickleaf (R)

Mentzelia veatchiana Kellogg Veatch Stickleaf (R)

Micropus californicus Fischer & C. Meyer var. californicus Slender Cottonweed (U)

Microseris douglasii (DC.) Schultz-Bip. ssp. douglasii Douglas Microseris (R)

Microseris douglasii ssp. tenella (A. Gray) Chambers Slender Douglas Microseris (R)

Microseris elegans A. Gray Elegant Microseris (R)

Mimulus androsaceus Greene Naked Sepal Monkeyflower (R)

Mimulus aurantiacus var. parviflorus (Greene) D.M. Thompson Bush Monkeyflower (R)

Mimulus bigelovii (Gray) Gray var. bigelovii Bigelow Monkeyflower (R)

Mimulus bolanderi Gray Bolander Monkeyflower (R)

Mimulus breweri (E. Greene) Cov. Brewer Monkeyflower (R)

Mimulus congdonii Robinson Congdon Monkeyflower (R)

Mimulus constrictus (A.L. Grant) Pennell Narrow-throated Monkeyflower (U)

Mimulus flemingii Munz Island Bush Monkeyflower (R)

Mimulus floribundus Lindley Floriferous Monkeyflower (U)

Mimulus fremontii (Benth.) Gray var. fremontii Fremont Monkeyflower (U)

Mimulus johnstonii A.L. Grant Johnston Monkeyflower (R)

Mimulus longiflorus var. rutilus A. Grant Red Sticky Bush Monkeyflower (R)

Mimulus moschatus var. longiflorus A. Gray Musk Monkeyflower (R)

Mimulus parishii E. Greene Parish’s Monkeyflower (R)

Mimulus primuloides Benth. var. primuloides Primrose Monkeyflower (R)

Mimulus puniceus Nuttall Red Bush Monkeyflower (R)

Mimulus rattanii Gray Rattan’s Monkeyflower (R)

Mimulus rubellus Gray Little Redstem Monkeyflower (R)

Mimulus suksdorfii Gray Suksdorf Monkeyflower (R)

Mimulus tilingii Regel Creeping Monkeyflower (R)

Minuartia douglasii (Fenzl ex T. & G.) Mattf. Douglas Sandwort (R)

Minuartia pusilla (S. Watson) Mattf. Sandwort (R)

Mirabilis multiflora var. pubescens S. Watson Froebel Four O’Clock (R)

Monanthochloe littoralis Engelm. Shoregrass (R)

Monardella breweri Gray Brewer Coyote Mint (U)

Monardella hypoleuca Gray ssp. hypoleuca White-veined Coyote Mint (R)

Monardella linioides ssp. oblonga (Greene) Abrams Flax-leaved Horsemint (R) CNPS List 1B

Monardella undulata Benth. Curly-leaved Horsemint (R)

Monolepis nuttalliana (Schultes) E. Greene Nuttall Monolepis, Poverty Weed (R)

Monolopia lanceolata Nuttall Lanceleaf Hilltop Daisy (R)

Monolopia major DC. Cupped Daisy (R)

Scientific Name Common Name

Montia chamissoi (Ledeb. Ex Spreng.) Greene Toad-Lily (R)

Mucronea californica Benth. var. californica California Spineflower (R)

Mucronea perfoliata (Gray) A.A. Heller var. perfoliata Perfoliate Spineflower (R)

Muhlenbergia andina (Nuttall) A. Hitchc. Foxtail Muhly (R)

Muhlenbergia asperifolia (Nees & Meyen) Parodi Scratchgrass (U)

Muhlenbergia richardsonis (Trin.) Rydberg Mat Muhly (R)

Muhlenbergia utilis (Torrey) A. Hitchc. Aparejo Grass (R)

Muilla maritima (Torrey) S. Watson Common Muilla (U)

Myosurus minimus L. Common Mousetails (R)

Myrica californica Chamisso California Wax-Myrtle, Pacific Bayberry (R)

Myriophyllum hippuroides Torrey & A. Gray Western Milfoil (R)

Najas guadalupensis (Sprengel) Magnus Common Water-nymph, Southern Naiad (R)

Nama californicum (Gray) J.D. Bacon Lemmon California Waterleaf (U)

Navarretia atractyloides (Benth.) Hook. & Arn. Hollyleaf Skunkweed (R)

Navarretia hamata E. Greene ssp. hamata Navarretia (R)

Navarretia ojaiensis Elvin, J.M. Porter & L.A. Johnson Ojai Navarretia (U) CNPS List 1B.1

Navarretia mellita E. Greene Sticky Navarretia (R)

Navarretia peninsularis Greene Southern California Navarretia (R)

Navarretia squarrosa (Eschsch.) Hook. & Arn. Downy Navarretia (R)

Nemacladus capillaris Greene Common Nemacladus (R)

Nemacladus glandulerus var. occidentalis McVaugh Western Sticky Nemacladus (R)

Nemacladus gracilis Eastw. Slender Nemacladus (R)

Nemacladus ramosissimus Nuttall Nuttall’s Nemacladus (R)

Nemacladus secundiflorus G.T. Robbins Secund Nemacladus (R)

Nemacladus sigmoideus G.T. Robbins Thread Stem (R)

Nemophila menziesii var. integrifolia Parish Baby Blue-eyes (R)

Nemophila parviflora Douglas ex Bentham var. parviflora Smallflower Nemophila (R)

Nemophila pulchella var. fremontii (A.D.E. Elmer) Constance Fremont Baby Blue-eyes (R)

Nicotiana attenuata Torrey Coyote Tobacco (U)

Nicotiana clevelandii A. Gray Cleveland Indian Tobacco (R)

Nicotiana quadrivalis Pursh var. quadrivalis Indian Tobacco (R)

Nicotiana quadrivalis Pursh var. wallacei (Gray) Mansf. Wallace’s Indian Tobacco (R)

Nolina cismontana Dice Chaparral Bear-grass (R) CNPS List 1B

Notholeana californica D.C. Eaton California Cloak Fern (R)

Oenothera deltoides ssp. cognata (Jepson) Klein Birdcage Evening-primrose, Devil’s Lantern (R)

Oenothera elata ssp. hookeri (Torrey & A. Gray) W. Dietr. Hooker Coast Evening Primrose (R)

Oenothera longissima ssp. clutei (Nelson) Munz Evening Primrose (R)

Oligomeris linifolia (M. Vahl) J.F. Macbr. Narrowleaf Oligomeris (U)

Opuntia basilaris Engelm. & J. Bigelow var. basilaris Beavertail Cactus (R)

Opuntia littoralis (Engelm.) Cockerell XO. oricola Philbr. Coastal-Round-pad Prickly Pear Hybrid (R)

Opuntia oricola Philbr. Round-pad Prickly Pear (U)

Opuntia parryi Engelm. Cane or Snake Cholla (R)

Opuntia prolifera Engelm. Coastal Cholla (R)

Opuntia Xvaseyi (J. Coulter) Britton & Rose (O. littoralis X phaeacantha) Mesa Prickly Pear (R)

Orcuttia californica Vasey California Orcutt Grass (R)

Orobanche bulbosa (Gray) G. Beck Chamise Broom-rape (U)

Orobanche californica ssp. feudgei (Munz) Heckard California Sagebrush Broom-rape (R)

Orobanche fasciculata Nuttall Clustered Broom-rape (U)

Orobanche parishii ssp. brachyloba Heckard Short-lobed Broom-rape (R)

Orobanche parishii (Jeps.) Heckard ssp. parishii Parish Broom-rape (R)

Orobanche uniflora L. Naked Broomrape (R)

Orobanche vallicola (Jepson) Heckard Hillside Broomrape (R)

Orobanche valida Jeps. ssp. valida Rock Creek Broom-rape (R)

Osmorhiza chilensis H.& A. Mountain Sweetroot (R)

Oxalis albicans ssp. californica (Abrams) G. Eiten California White Wood Sorrel (R)

Oxalis albicans ssp. pilosa (Nuttall) G. Eiten Hairy White Wood Sorrel (R)

Scientific Name Common Name

Oxytheca caryphylloides Parry Chickweed Oxytheca (R) CNPS List 4

Oxytheca parishii var. abramsii (McGregor) Munz Abrams Oxytheca (R, Type) CNPS List 1B

Oxytheca perfoliata T. & G. Perfoliate Oxytheca (R)

Oxytheca trilobata A. Gray Three-lobed Spineflower (R)

Packera breweri (Burtt Davy) W.A. Weber & Löve Brewer Butterweed or Groundsel (U)

Panicum capillare ssp. hillmanii (Chase) Freckmann & Lelong Hillman Witchgrass (U)

Papaver californicum Gray Wind or Fire Poppy (R)

Parietaria hespera var. californica B.D. Hinton California Pellitory (R)

Parietaria hespera B.D. Hinton var. hespera Southwest Pellitory (U)

Parietaria pensylvanica Muhlenberg ex Wildenow Pennsylvania Pellitory (R)

Parishella californica A. Gray Parishella (R)

Parthenocissus vitaea (Knerr) Hitchc. Woodbine (R)

Paspalum distichum L. Joint Dallis Grass or Knotgrass (R)

Pectocarya heterocarpa I.M. Johnston Two-faced Pectocarya (R)

Pectocarya linearis ssp. ferocula (I.M. Johnston) Thorne Linear Pectocarya (U)

Pectocarya penicillata (Hook. & Arn.) A. DC. Winged Pectocarya (R)

Pectocarya setosa Gray Setose Pectocarya (U)

Pedicularis densiflora Hook. Indian Warrior (R)

Pedicularis semibarbata Gray Pine-woods Lousewort (U)

Pediomelum castoreum (S. Watson) Rydb. Desert Indian Breadroot (R)

Pellaea mucronata var. californica (Lemmon) Munz & I.M. Johnston California Birdsfoot Cliffbrake or Fern (R)

Penstemon grinnellii Eastwood var. grinnellii Grinnell Beardtongue (U)

Penstemon heterophyllus var. australis Munz & I.M. Johnston Southern Mountain Penstemon (R)

Penstemon laetus Gray var. laetus Gay Penstemon (R)

Penstemon speciosus Lindley Showy Beardtongue (R)

Pentachaeta fragilis Brandegee Fragile Pentachaeta (R)

Pentachaeta lyonii Gray Lyon’s Pentachaeta (R) Listed Endangered

Perideridia gairdneri (Hook. & Arn.) Mathias ssp. gairdneri Gairdner Yampah (R)

Perideridia parishii ssp. latifolia (Gray) Chuang & Constance Parish Yampah (R)

Perideridia pringlei (J.M. Coulter & Rose) A. Nelson & J.F. Macbr. Adobe or Pringle Yampah (U) CNPS List 4

Perityle emoryi Torrey Rock Daisy (U)

Phacelia affinis Gray var. affinis Phacelia (R)

Phacelia austromontana J.T. Howell Low Phacelia (R)

Phacelia bicolor Torrey ex S. Watsion Bicolored Phacelia (R)

Phacelia cicutaria E. Greene var. cicutaria Caterpillar Phacelia (U)

Phacelia cicutaria var. hubbyi (J.F. Macbr.) J.T. Howell Hubby Caterpillar Phacelia (U)

Phacelia ciliata Benth. var. ciliata Ciliate Phacelia (U)

Phacelia cinerea Eastw. Ashy Phacelia (R, Type) CNPS 1A

Phacelia exilis (Gray) G.J. Lee Transverse Range Phacelia (R) CNPS 4.3

Phacelia grisea Gray White-flowered Phacelia (R)

Phacelia humilis var. dudleyi J. Howell Dudley Phacelia (R)

Phacelia imbricata ssp. patula (Brand) Heckard Mountain Phacelia (R)

Phacelia minor (Harvey) Thellung Wild Canterberry Bell (R)

Phacelia mohavensis A. Gray Mojave Phacelia (R) CNPS 4.3

Phacelia mutabilis Greene Changeable Phacelia (R)

Phacelia oreopola Heckard ssp. oreopela Mountain Phacelia (R)

Phacelia ramosissima var. austrolittoralis Munz South Coast Branching Phacelia (R) CNPS 4.3

Phacelia ramosissima var. latifolia (Torrey) Cronq. Branching Phacelia (U)

Phacelia rattanii A. Gray Brand Phacelia (R)

Phacelia viscida var. albiflora (Nuttall) A. Gray White-flowered Viscid Phacelia (R)

Phalaris lemmonii Vasey Lemmon Canarygrass (R)

Phlox austromontana Coville Spreading Phlox (R)

Phlox caespitosa Nuttall Rigid Mat Phlox (R)

Phlox diffusa Benth. Mat Phlox (R)

Phlox hoodii ssp. canescens (T. & G.) Wherry Fuzzy Hood Phlox (R)

Pholistoma membranaceum (Benth.) Constance White Fiesta Flower (R)

Scientific Name Common Name

Phoradendron pauciflorum Torrey Few-flowered Mistletoe (R)

Phragmites australis (Cav.) Steudel Common Reed (R)

Phyla nodiflora (L.) E. Greene var. nodiflora Common Frog-fruit (R)

Phyllospadix scouleri Hook. Scouler Surf-grass (R)

Phyllospadix torreyi S. Watson Torrey Surf-grass (R)

Pickeringia montana Nutt. var. montana Chaparral Pea (R)

Pilularia americana A. Braun American Pillwort (R)

Pinus coulteri D. Don Coulter Pine (R)

Pinus flexilis E. James Limber Pine (R)

Pinus sabiniana Douglas Foothill or Gray Pine (R)

Piperia elongata Rydb. Dense-flowered Rein Orchid (R)

Piperia michaelii (Greene) Rydb. Michael Piperia (R) CNPS 4.2

Piperia unalascensis (Spreng.) Rydb Slender-spire Orchid (R)

Plagiobothrys acanthocarpus (Piper) I.M. Johnston Adobe Popcornflower (R)

Plagiobothrys arizonicus (Gray) Gray Arizona Popcornflower (R)

Plagiobothrys canescens Benth. Valley or Bracted Popcornflower (R)

Plagiobothrys collinus var. fulvescens (I.M. Johnston) Higgins Popcornflower (R)

Plagiobothrys collinus var. gracilis (A. Gray) Higgins Slender California Popcornflower (R)

Plagiobothrys hispidulus (E. Greene) I.M. Johnston Hispid Popcornflower (R)

Plagiobothrys tenellus (Nuttall) A. Gray Slender Popcornflower (R)

Plagiobothrys undulatus (Piper) I.M. Johnston Undulate Popcornflower (R)

Plantago elongata Pursh Coastal Plantain (R)

Plantago patagonica Jacq. Patagonia Plantain (R)

Plantago pusilla Nuttall Plantain (R)

Platanthera leucostachys Lindley White-flowered Bog-Orchid (R)

Platanthera sparsiflora (S. Watson) Schltr. Few-flowered Rein Orchid (R)

Platystemon californicus Benth. var. californicus Cream Cups (U)

Plectritis ciliosa ssp. insignis (Suksd.) D. Morey Petite Long-spurred Plectritis (R)

Plectritis macrocera Torrey & A. Gray White Plectritis (R)

Pluchea odorata (L.) Cass. Saltmarsh Fleabane (U)

Pluchea sericea (Nutt.) Coville Arrow Weed (R)

Poa secunda ssp. juncifolia (Scribner) R. Soreng Rush Bluegrass (R)

Polemonium micranthum Benth. Phlox (U)

Polycarpon depressum Nutt. California Allseed (R)

Polygala cornuta var. fishiae (C. Parry) Jeps. Fish Milkwort (U) CNPS List 4

Polygonum amphibium var. emersum Michx. Kelp, Water-Smartweed (R)

Polygonum douglasii ssp. johnstonii (Munz) J. Hickman Sawatch Knotweed (R)

Polygonum hydropiperoides Michaux Mild Water Pepper, Water Smartweed (R)

Polygonum lapathifolium L. Willow Weed (U)

Polygonum polygaloides ssp. kelloggii (Greene) J. Hickman Kellogg Knotweed (R)

Polygonum punctatum Elliott Dotted Smartweed (U)

Polygonum sawatchense Small ssp. sawatchense Sawatch Smartweed (R)

Polypodium hesperium Maxon Western Polypody (R)

Polystichum imbricans ssp. curtum (Ewan) D.H. Wagner Imbricate Sword Fern (R)

Polystichum imbricans (D.C. Eaton) D.H. Wagner ssp. imbricans Imbricate Sword Fern (R)

Populus balsamifera ssp. trichocarpa (T. & G.) Brayshaw Black Cottonwood (Type)

Populus fremontii Wats. XP. balsamifera ssp. trichocarpa (T. & G.) Brayshaw Hybrid Fremont Cottonwood (R)

Potamogeton foliosus Raf. var. foliosus Leafy Pondweed (R)

Potamogeton nodosus Poiret Long-leaved Pondweed (R)

Potamogeton pectinatus L. Fennel-leaf Pondweed (R)

Potentilla anserina ssp. pacifica (Howell) Rousi Pacific Coast Cinquifoil or Silverweed (R)

Potentilla biennis Greene Biennial Cinquifoil (R)

Potentilla glandulosa Lindley ssp. glandulosa Sticky Cinquifoil (U)

Potentilla glandulosa ssp. nevadensis (S. Watson) Keck Sierra Nevada Sticky Cinquifoil (R)

Potentilla glandulosa ssp. reflexa (Greene) Keck Greene Cinquifoil (R)

Potentilla gracilis var. elmeri (Rydb.) Jeps. Elmer Slender Cinquifoil (R, Type)

Scientific Name Common Name

Prunus emarginata (Hooker) Walp. Bitter Cherry (R)

Prunus ilicifolia ssp. lyonii (Eastw.) P. Raven Catalina Cherry (R)

Pseudognaphalium beneolens (A. Gray) Anderberg Coastal Everlasting (U)

Pseudognaphalium leucocephalum (A. Davidson) Anderberg Whiteleaf or Sonora Everlasting (R) CNPS 2.2

Pseudognaphalium ramosissimum (Nutt.) Anderberg Pink Everlasting (R)

Pseudostellaria jamesiana (Torrey) W.A. Weber & R.I. Hartman False Chickweed (R)

Psilocarphus brevissimus Nutt. var. brevissimus Woolly Marbles (R)

Psilocarphus tenellus var. globiferus (DC.) Morefield Round Woolly Marbles (R)

Pteridium aquilinum var. pubescens L. Underw. Western Bracken [Fern] (U)

Purshia tridentata var. glandulosa (Curran) M.E. Jones Antelope Bush (U)

Pyrola picta Smith White-veined Wintergreen (R)

Pyrrocoma racemosa var. paniculata (Nutt.) J. Kartesz & K. Gandhi Pyrrocoma (R)

Quercus douglasii H. & A. Blue Oak (R)

Quercus dumosa Nutt. Nuttall or Coastal Sage Scrub Oak (R) CNPS 1B

Quercus palmeri Engelm. Palmer Oak (R)

Quercus tomentella Engelm. Channel Island Oak (R)

Quercus turbinella Greene ssp. turbinella Sonoran Scrub Oak (R)

Quercus wislizenii ssp. frutescens (Engelm.) E. Murray Shrubby Interior Live Oak (U)

Quercus Xalvordiana Eastwood (Q. douglasii XQ. john-tuckeri) Alvord Oak (R)

Quercus Xmacdonaldii Greene MacDonald Oak (R)

Ranunculus californicus Bentham var. californicus California Buttercup (U)

Ranunculus cymbalaria Pursh Desert Buttercup (U)

Ranunculus hebecarpus Hooker & Arnott Hebe-fruited Buttercup (R)

Rhamnus tomentella ssp. cuspidata (Greene) Sawyer Cuspid Hoary Coffeeberry (R)

Rhus integrifolia (Nutt.) Brewer & S. Watson XR. ovata S. Watson Lemonade Berry-Sugar Bush Hybrid (R)

Rhus trilobata var. malacophylla (E. Greene) Jepson Woolly Skunkbrush (U)

Ribes amarum McClatchie var. amarum Bitter Gooseberry (R)

Ribes amarum var. hoffmannii Munz Hoffmann’s Bitter Gooseberry (R, CNPS 3)

Ribes aureum var. gracillimum (Cov. & Britton) Jeps. Slender Golden Currant (R)

Ribes californicum Hooker & Arnott var. californicum Hillside Gooseberry (R)

Ribes californicum var. hesperium (McClatchie) Jeps. Southern Calif. Gooseberry (U)

Ribes cereum Douglas var. cereum Wax Currant (U)

Ribes indecorum Eastw. White-flowered Currant (R)

Ribes montigenum McClatchie Mountain Gooseberry (R)

Ribes nevadense Kellogg Mountain Pink Currant (R)

Ribes quercetorum Greene Oak Gooseberry (R)

Ribes roezlii Regel var. roezlii Sierra Gooseberry (U)

Ribes velutinum Greene Plateau Gooseberry (R)

Rigiopappus leptocladus Gray Rigiopappus (U)

Romneya coulteri Harvey Coulter Matilija Poppy (R) CNPS List 4

Rorippa palustris var. occidentalis (S. Watson) Rollins Western Riparian Yellow-cress (R)

Rosa woodsii var. ultramontana (S. Watson) Jeps. Interior Wild Rose (R)

Rumex hymenosepalus Torrey Wild Rhubarb, Canaigre (R)

Rumex maritimus L. Golden Dock (R)

Rumex salicifolius var. crassus (Rech. f.) J. Howell Willow Dock (R)

Rupertia physodes (Hook.) Grimes Scurf-pea (R)

Ruppia cirrhosa (Petagna) Grande Spiral Wigeon-grass or Ditch-grass (R)

Ruppia maritima L. Wigeon-grass, Ditch-grass (R)

Sagina apetala L. ssp. apetala Dwarf Pearlwort (R)

Sagina decumbens ssp. occidentalis (S. Wats.) G. Crow Western Pearlwort (R)

Sagina saginoides (L.) H. Karst. Sagina, Arctic Pearlwort (R)

Sagittaria sanfordii Greene Sanford Arrow-head (R) CNPS List 1B

Salicornia bigelovii Torrey Bigelow Pickleweed (R)

Salicornia depressa Standley Pickleweed (R)

Salix gooddingii C. Ball Goodding Black Willow (R)

Salix macrostachya var. leucodendroides Rowlee Sandbar Willow (U)

Scientific Name Common Name

Salix hindsiana var. parishiana (Rowlee) C. Ball Sandbar Willow (R, Type)

Salix lasiolepis var. bigelovii (Torrey) Bebb. Bigelow Arroyo Willow (R)

Salvia carduacea Benth. Thistle Sage (R)

Salvia dorrii var. pilosa (Gray) Strachan & Reveal Pilose Desert Sage (R)

Samolus parviflorus Raf. Water-pimpernel (R)

Sanicula bipinnata Hooker & Arnott Poison Sanicle (U)

Sanicula bipinnatafida Hooker Purple Sanicle (R)

Sanicula graveolens Peopp. ex DC. Sanicle (R)

Sanicula tuberosa Torrey Tuberose Sanicle (R)

Sarcocornia pacifica (Standley) A.J. Scott [Salicornia virginica L.] Pacific Pickleweed or Swampfire (R)

Sarcodes sanguinea Torrey Snow Plant (U)

Satureja douglasii (Benth.) Briq. Yerba Buena (R)

Satureja mimuloides (Bentham) Briq. Monkeyflower Yerba Buena (R)

Saussurea americana D. Eaton American Sawwort (R)

Saxifraga californica Greene California Saxifrage (R)

Schoenoplectus acutus var. occidentalis (S. Watson) S.G. Smith Viscid Tule (R)

Schoenoplectus californicus (C. Meyer) Soják, Čas. Nár. California Bulrush (R)

Schoenoplectus pungens (Vahl) Palla Common Threesquare (U)

Schoenoplectus saximontanus (Fern.) J. Raynal Rocky Mountain Bulrush (R)

Schoenoplectus tabernaemontani (C. Gmelin) Palla Soft-stem Bulrush (R)

Scirpus microcarpus J. Presl & C. Presl Small-fruited Bulrush (U)

Scrophularia californica ssp. floribunda (E. Greene) Shaw Many-flowered Figwort (R)

Scutellaria siphocampyloides Vatke Skullcap (U)

Scutellaria tuberosa Benth. Danny Skullcap (U)

Senecio aphanactis Greene Rayless Ragwort (R)

Senecio flaccidus var. monoensis (Greene) B.L.Turner & T.M.Barkley Mono Butterweed (R)

Setaria gracilis Kunth Knotroot Bristlegrass (R)

Shepheria argentea Nutt. Buffalo Berry, Silver Buffaloberry (U)

Sidalcea malviflora ssp. californica (T. & G.) C.L. Hitchc. California Globemallow (U)

Sidalcea malviflora ssp. dolosa C.L. Hitchc. Dwarf Globemallow or Checkerbloom (R)

Sidalcea neomexicana Gray Salt Spring Checkermallow (R) CNPS List 2

Sidalcea pedata Gray Bird-footed Checkerbloom (R)

Silene antirrhina L. Snapdragon Campion, Catchfly (U)

Silene bernardina S. Watson Palmer Campion (R)

Silene californica Durand California Indian Pink (R)

Silene lemmonii S. Watson Lemmon Campion or Catchfly (R)

Silene multinerva S. Watson Many-veined Campion (U)

Solanum parishii A.A. Heller Parish Nightshade (R)

Solanum umbelliferum Eschsch. Blue Witch (U)

Solidago confinis Gray Southern Goldenrod (U)

Solidago guiradonis Gray Guirado Goldenrod (R)

Spergularia macrotheca var. leucantha (E. Greene) Robinson White Large[-flowered] Sandspurrey (R)

Spergularia macrotheca (Hornem.) Heynh. var. macrotheca Large[-flowered] Sandspurrey (R)

Spergularia marina (L.) Griseb. Saltmarsh Sandspurrey (R)

Sphenosciadium capitellatum Gray Ranger Buttons, Swamp White Heads (R)

Sporobolis airoides (Torey) Torrey Alkali Sacaton (R)

Stachys ajugoides var. rigida Jeps. & Hoover Rigid Hedge Nettle (R)

Stebbinsoseris heterocarpa (Nuttall) Chambers Chicory Microseris (U)

Stellaria nitens Nuttall Shining Chickweed (R)

Stephanomeria exigua ssp. carotifera (Hoover) Gottlieb Carot Stephanomeria (U)

Stephanomeria exigua ssp. coronaria (Greene) Gottlieb Small Stephanomeria (U)

Stephanomeria exigua Nuttall ssp. exigua Small Stephanomeria (R)

Stephanomeria pauciflora (Nutt.) Nelson var. pauciflora Wire-lettuce (U)

Stephanomeria virgata ssp. pleurocarpa (Greene) Gottlieb Two-fruited Wreath Plant (R)

Stillingia linearifolia S. Watson Narrowleaf Stillingia (R-extirpated?)

Stillingia spinulosa Torrey Annual Toothleaf (R-extirpated?)

Scientific Name Common Name

Streptanthus campestris S. Watson Southern Jewelflower (R)

Stylocline gnaphaloides Nuttall Everlasting Nest Straw (U)

Stylomecon heterophylla (Benth.) G. Taylor Wind Poppy (R)

Suaeda calceoliformis (Hook.) Moq. Seablite (R)

Suaeda esteroa Ferren & Whitmore Estuary Seablite (R) CNPS List 1B

Suaeda moquinii (Torrey) Greene Bush Seepweed (R)

Suaeda taxifolia (Standl.) Standl. Woolly Seablite (R) CNPS List 4

Swertia neglecta (H.M. Hall) Jeps. Pine Green Gentian (U) CNPS List 4

Symphoricarpos albus var. laevigatus (Fern.) S.F. Blake Snowberry (R)

Syntrichopappus lemmonii (A. Gray) A. Gray Lemmon’s Xerasid (R) CNPS List 4

Tauschia hartwegii (A.Gray) J.F. Macbr. Hartweg Tauschia (R)

Tetradymia canescens DC. Cottonthorn, Horsebush (R)

Tetradymia comosa Gray Cottonthorn, Horsebush (R)

Thalictrum fendleri Engelmann ex Gray Fendler Meadow-rue (R)

Thalictrum polycarpum (Torrey) S. Watson Tall Western Meadow-rue (R)

Thermopsis californica var. argentata (Greene) Chen & Turner Silvery False-Lupine (U) CNPS List 4

Thermopsis macrophylla var. venosa (Eastwood) Isely Slender Santa Ynez False-Lupine

Trichostema micranthum Gray Bluecurls (R)

Trichostema ovatum Curran Ovate Bluecurls (R)

Trifolium albopurpureum var. dictotomum (H. & A.) Isely Island Rancheria Clover (R)

Trifolium ciliolatum Benth. Ciliate or Tree Clover (U)

Trifolium cyathiferum Lindley Ciliate or Tree Clover (R)

Trifolium depauperatum var. amplectens (T. & G.) L.F. McDermott Dwarf Sack Clover (R)

Trifolium depauperatum var. truncatum (Greene ) Islay Truncate Dwarf Sack Clover (U)

Trifolium fucatum Lindley Bull Clover (R)

Trifolium gracilentum var. palmeri (Watson) McDermott Palmer Pinpoint Clover (R)

Trifolium longipes ssp. atrorubens (Greene) J.M. Gillett Purple Clover (R)

Trifolium microcephalum Pursh Tiny-head Clover (U)

Trifolium microdon Hook. & Arn. Tiny-head Clover (R)

Trifolium monanthum Gray var. monanthum Carpet Clover (R)

Trifolium monanthum var. grantianum (A.A. Heller) Parish Carpet Clover (R)

Trifolium obtusiflorum Hooker & Arnott Creek Clover (R)

Trifolium variegatum Nutt. Whitetip Clover (R)

Trifolium wormskioldii Lehm. Cows Clover (R)

Triglochin concinna Davy var. concinna Utah Arrow-grass (R)

Triglochin maritima L. Seaside Arrow-grass (R)

Triglochin striata R. & P. Three-ribbed Arrow-grass (R)

Triteleia ixioides (Aif. F.) Greene ssp. ixioides Golden Brodiaea (R)

Tropidocarpum gracile Hook. [var. dubium] Slender Tropidocarpum (R)

Typha angustifolia L. Slender Cattail (R)

Typha latifolia L. Broad-leaved Cattail, Soft Flag (U)

Typha Xdomingensis Pers. Southern Cattail Hybrid (R)

Veratrum californicum Durand var. californicum California False Hellebore (R)

Verbena bracteata Lagasca & J.D. Rodriguez Prostrate Verbena (R)

Verbena lasiostachys var. scabrida Mold. Western Verbena (R)

Veronica peregrina ssp. xalapensis (Kunth) Pennell Purslane Speedwell (U)

Veronica serpyllifolia ssp. humifusa (Dickson) Syme Tyme-leaved Speedwell (R)

Vicia americana Willd. var. americana American Vetch (U)

Vicia hassei S. Watson Hasse Vetch (R)

Vicia ludoviciana Nutt. var. ludoviciana Vetch (R)

Viguiera laciniata Gray San Diego County Viguiera (R)

Viola aurea Kellogg Golden Violet (R)

Viola macloskeyi F.E. Lloyd ssp. macloskeyi Small White Violet (R)

Viola pedunculata ssp. tenuifolia M.S. Baker & J.C. Clausen Johnny-Jump-Up (U)

Viola pinetorum ssp. grisea (Jeps.) R.J. Little Gray-leaved Violet (R) CNPS 1B

Viola pinetorum Greene ssp. pinetorum Mountain Violet (U)

Scientific Name Common Name

Viola purpurea Kellogg ssp. purpurea Purple or Mountain Violet (U)

Viola purpurea ssp. mohavensis (M. Baker & J. Clausen) J. Clausen Mojave Yellow Violet (U)

Viola purpurea ssp. quercetorum (M. Baker & J. Clausen) R.J. Little Oak Violet (U)

Vitis californica Benth. California Wild Grape (R)

Vitis girdiana Munson Desert Wild Grape (R)

Vulpia microstachys var. confusa (Piper) Lonard & Gould Ciliate Fescue (R)

Yabea microcarpa (Hooker & Arnott) Koso-Pol. Yabea (R)

Zannichellia palustris L. Horned-Pondweed (R)

Zostera marina L. Eel-grass (R)

Plants Expected to Occur in Ventura County But Lacking Physical Evidence[9]

Scientific Name Common Name

Abronia latifolia Eschsch. Coastal or Yellow Sand-verbena Ф

Achnatherum latiglumis (Swallen) Barkworth Needlegrass Ф

Actaea rubra (Aiton) Wildenow Red Banberry Ф

Adiantum aleuticum (Rupr.) C.A. Paris Western Five-finger Fern or Maidenhair Ф

Agastache urticifolia (Bentham) Kuntze var. urticifolia Nettleleaf Horsemint, Giant Hyssop Ф

Agrostis microphylla Steudel Small-leaved Bentgrass Ф

Agrostis scabra Willd. Rough Bentgrass Ф

Allenrolfea occidentalis (S. Watson) Kuntze Iodine Bush Ф

Allophyllum integrifolium (Brand) A.D. Grant & V. Grant Sticky Allophyllum Ф

Alopecurus aequalis Sobol. var. aequalis Short-awn Foxtail Ф

Alopecurus geniculatus L. Water Foxtail Ф

Ambrosia dumosa (A. Gray) Payne White Bur-sage, Burro Bush, Burro-Weed Ф

Amsinckia eastwoodae J.F. Macbr. Elegant Fiddleneck Ф

Anaphalis margaritaceae (L.) Benth. & Hooker F. ex C.B. Clarke Pearly Everlasting Ф

Arabis platysperma Gray var. platysperma Pioneer Rock Cress Ф

Aristida purpurea var. nealleyi (Vasey) K.W. Allred Nealley Three-awn Grass Ф

Aristida purpurea Nuttall var. purpurea Purple Three-awn Grass Ф

Aristida purpurea var. wrightii (A. Hitchc.) K.W. Allred Parish Three-awn Grass Ф

Arnica discoidea Benth. var. discoidea Rayless or Discoid Arnica Ф

Artemisia ludoviciana ssp. incompta (Nuttall) Keck White Sagebrush Ф

Aster occidentalis (Nuttall) Torrey & A. Gray var. occidentalis Western Mountain Aster Ф

Athyrium filix-femina var. californicum Butters Southwestern Lady Fern Ф

Athyrium filix-femina var. cyclosorum Ruprecht Northwestern Lady Fern Ф

Atriplex parishii S. Watson Parish Brittlescale Ф

Azolla mexicana C. Presl Mexican Duckweed Fern Ф

Berberis pinnata Lagasca ssp. pinnata Pinnate-leaved Barberry Ф

Brodiaea elegans Hoover ssp. elegans Elegant Brodiaea Ф

Brodiaea jolonensis Eastwood Dwarf Brodiaea Ф

Calystegia longipes (S. Watson) Brummitt Morning-glory Ф

Calystegia sepium ssp. limnophila (E. Greene) Brummitt Riparian Morning-glory Ф

Carex schottii Dewey Schott Sedge Ф

Carex serratodens W. Boott Sawtooth Sedge Ф

Castilleja campestris (Bentham) Chuang & Heckard ssp. campestris Field Owl’s Clover Ф

Castilleja densiflora ssp. gracilis (Benth.) Chuang & Heckard Slender Dense-flowered Owl’s Clover Ф

Castilleja plagiotoma A. Gray Mojave Indian Paintbrush Ф

Castilleja tenuis (A.A. Heller) Chuang & Heckard Bristle Owl’s Clover Ф

Scientific Name Common Name

Caulanthus crassicaulis (Torrey) S. Watson var. crassicaulis Thick-stem Wild Cabbage Ф

Centaurium muhlenbergii (Griseb.) W. Wright ex Piper Monterey Centaury Ф

Centromadia fitchii (A. Gray) E. Greene Fitch Spikeweed Ф

Cephalanthera austiniae (A. Gray) Heller Phantom Orchid Ф

Chamaesyce serpyllifolia ssp. hirtula (S. Watson) Koutnik Hairy Thyme-leaved Spurge Ф

Chorizanthe fimbriata Nuttall var. fimbriata Fringed Spineflower (R) – Newhall Ranch

Chorizanthe obovata Goodman Obovate Spineflower Ф

Chorizanthe wheeleri S. Watson Wheeler Spineflower Ф

Circaea alpina ssp. pacifica (Aschers. & Magnus) Raven Enchanter’s Nightshade Ф

Cladium californicum (S. Watson) O’Neill Saw-grass Ф

Clarkia heterandra (Torrey) H. Lewis & Raven California Gaura Ф

Clarkia similis Harlan Lewis & Ernst Copy-cat Clarkia Ф

Clematis pauciflora Nuttall Ropevine Ф

Collomia linearis Nuttall Narrow-leaved Collomia Ф

Comarostaphylis diversifolia ssp. planifolia (Jeps.) G.D. Wallace Simpleleaf Summer Holly Ф

Corallorhiza maculata (Raf.) Raf. Spotted Coral Root Ф

Coreopsis californica (Nuttall) H.K. Sharsmith var. californica California Coreopsis Ф

Cornus nuttallii Audubon Mountain Dogwood Ф

Cornus sericea ssp. occidentalis (Torrey & A. Gray) Fosberg Western American Dogwood Ф

Crassula solieri (C. Gay) F. Meigen Solier Vernal Pool Water Pigmy-weed Ф

Cucurbita palmata S. Watson Coyote Melon Ф

Cuscuta californica var. papillosa Yuncker California Dodder Ф

Cyperus niger Ruiz Lopez & Pavon Black Flatsedge Ф

Damasonium californicum Bentham Fringed Water-Plantain Ф

Deschampsia elongata (Hooker) Bentham Slender Hairgrass Ф

Descurainia incisa (A. Gray) Britton ssp. incisa Richardson Tansy Mustard Ф

Dodecatheon clevelandii E. Greene ssp. clevelandii Cleveland Shooting Star Ф

Elatine rubella Rydb. Waterwort Ф

Eleocharis parvula (Roemer & Schultes) Link Colorado Spike-rush Ф

Epilobium halleanum Hausskn. Gland Willow-herb Ф

Eremalche exilis (A. Gray) E. Greene White-flowered Mallow Ф

Eremalche parryi ssp. kernensis (C. Wolf) D. Bates Kern Mallow Ф

Erigeron philadelphicus L. Philadelphia Fleabane Ф

Eriogonum pusillum T. & G. Puny Buckwheat Ф

Eriophyllum ambiguum (A. Gray) A. Gray var. ambiguum Ambiguous Woolly Daisy Ф

Eriophyllum lanatum var. hallii Constance Fort Tejon Yarrow Ф

Eschscholzia lemmonii ssp. kernensis (Munz) C. Clark Tejon Poppy Ф

Eustoma exaltatum (L.) Don Catchfly Gentian Ф

Euphorbia crenulata Engelmann Chinese Caps Ф

Fraxinus latifolia Bentham Oregon Ash Ф

Galium californicum ssp. flaccidum (E. Greene) Dempster & Stebb. California Bedstraw Ф

Garrya elliptica Lindley Silk-tassel Bush Ф

Gayophytum humile A.L. Juss. Low Gayophytum Ф

Gayophytum oligospermum H. Lewis & J. Szweykowski Southern California Mountain Gayophytum Ф

Geranium carolinianum L. Cransebill, Carolina Geranium Ф

Geranium richardsonii Fischer & Trautv. Mountain Geranium Ф

Gilia tricolor Bentham ssp. tricolor Birds-eye or Tricolor Gilia Ф

Glyptopleura marginata D. Eaton Sculpted-fruit Ф

Grayia polygaloides Hooker & Arnott Hop-Sage Ф

Helianthus californicus DC. California Sunflower Ф

Hesperolinon micranthum (A. Gray) Small Dwarf Flax Ф

Hesperomecon linearis (Bentham) E. Greene Western Poppy Ф

Heterocodon rariflorum Nuttall Western Pearl-flower Ф

Hordeum jubatum L. Foxtail Barley Ф

Hydrocotyle ranunculoidies L.f. False-crowfoot Pennywort Ф

Hydrocotyle umbellata L. Marsh Pennywort Ф

Scientific Name Common Name

Hymenoclea monogyra Torrey & Gray Leafy Burrobrush Ф

Hymenoclea salsola var. pentalepis (Rydb.) L. Benson Southern Burrobrush Ф

Iris douglasiana Herbert in W.J. Hooker and G.A.W. Arnott Mountain Iris Ф

Isoëtes orcuttii A.A. Eaton Orcutt Quillwort Ф

Juncus bryoides F.J. Hermann Moss Rush Ф

Juncus falcatus E. Meyer var. falcatus Sickleleaf Rush Ф

Juncus orthophyllus Cov. Straight-leaf Rush Ф

Lasthenia fremontii (A. Gray) E. Greene Fremont Goldfields Ф

Lasthenia glaberrima A. DC. Rayless or Smooth Goldfields Ф

Lasthenia microglossa (A. DC.) E. Greene Small-rayed Goldfields Ф

Layia hieracioides (DC.) Hooker & Arnott Tall Layia Ф

Lepidium latipes Hooker var. latipes Dwarf Peppergrass Ф

Lilaea scilloides (Poir.) Haum. Flowering Quillwort Ф

Lonicera hispidula var. vacillans A. Gray California Honeysuckle Ф

Lonicera interrupta Benth. X Lonicera hispidula var. vacillans Gray Chaparral Honeysuckle hybrid Ф

Luzula comosa E. Meyer Wood Rush Ф

Luzula subsessilis (S. Watson) Buchenau Wood Rush Ф

Madia elegans ssp. densifolia (E. Greene) Keck Dense-flowered Tarplant or Madia Ф

Malacothrix coulteri Gray Snake-head Ф

Mimulus palmeri A. Gray Palmer Monkeyflower Ф

Minuartia californica (A. Gray) Mattf. California Sandwort Ф

Monardella australis Abrams Southern Coyote Mint Ф

Monardella villosa ssp. obispoensis (Hoover) Jokerst San Luis Obispo Coyote Mint Ф

Najas marina L. Spiny Naiad Ф

Nemophila parviflora var. quercifolia (Eastw.) Chandler Oak-leaved Nemophila (R)

Opuntia phaeacantha Engelm. Engelmann Prickly Pear Ф

Orthocarpus linearilobus Bentham Pallid Owl’s Clover Ф

Osmorhiza chilensis Hooker & Arnott Mountain Sweetroot or Sweet Cicely Ф

Panicum acuminatum Sw. var. acuminatum Panicgrass Ф

Parnassia californica (A. Gray) E. Greene Grass-of-Parnassus Ф

Penstemon spectabilis Thurber var. [ssp.] spectabilis Royal Penstemon Ф

Penstemon spectabilis var. [ssp.] subviscosis (Keck) McMinn Sticky Royal Penstemon Ф

Phacelia congdonii Greene Congdon Phacelia Ф

Phoradendron libocedri (Engelm.) Howell Incense-cedar Mistletoe Ф

Physalis acutifolia (Miers) Sandw. Ground-cherry Ф

Plagiobothrys collinus var. californicus (A. Gray) Higgins California Popcornflower Ф

Plectritis brachystemon Fischer & C. Meyer Small-flowered Pink Plectritis Ф

Pogogyne zizyphoroides Bentham Sacramento Mesamint Ф

Polygonum amphibium var. stipulaceum Coleman Stipuled Water-Smartweed Ф

Polygonum douglasii E. Greene ssp. douglasii Douglas Knotweed Ф

Quercus garryana var. breweri (Engelm.) Jeps. Brewer Oregon Oak Ф

Ranunculus aquatilis var. capillaceus (Thuill.) DC. Slender White Water Crowfoot Ф

Rubus leucodermis var. bernardinus (E. Greene) Jepson Sticky Blackcap Raspberry Ф

Rubus parviflorus Nuttall Thimbleberry Ф

Sagittaria calycina Englemann Hooded Arrowhead Ф

Sagittaria latifolia Willd. Broadleaf Arrowhead Ф

Salix sitchensis Bong. Sitka Willow Ф

Sanicula hoffmannii (Munz) Stan & Constance Hoffmann’s Sanicle Ф

Scutellaria bolanderi ssp. austromontana Epling Southern Skullcap Ф

Senecio californicus DC. California Ragwort

Spirodela polyrrhiza (L.) Schlied. Duckmeat Ф

Spirodela punctata C. Thompson Duckmeat Ф

Sporobolus airoides Torrey Alkali Sacaton Ф

Streptanthella longirostris Rydb. Dwarf Jewelflower Ф

Thelypteris puberula var. sonorensis A.R. Smith Sonoran Maiden Fern Ф

Thermopsis macrophylla Hook. & Arn. var. macrophylla False-Lupine Ф

Scientific Name Common Name

Trichostema austromontanum Harlan Lewis ssp. austromontanum San Jacinto Bluecurls Ф

Trichostema parishii Vasey Parish Bluecurls Ф

Triteleia dudleyi Hoover Dudley Triteleia Ф

Triteleia hyacinthina (Lindley) E. Greene White Triteleia Ф

Triteleia ixioides ssp. scabra (E. Greene) L. Lenz Golden Brodiaea Ф

Triteleia laxa Bentham Ithuriel Spear Ф

Utricularia vulgaris L. Bladderwort Ф

Vaccinium ovatum Pursh California Huckleberry Ф

Viola sheltonii Torrey Shelton Violet Ф

Wolffia borealis Landolt & O. Wildi Water-meal Ф

Wolffia columbiana Karsten Coastal Water-meal Ф

Wolffia globosa Hartog & Plas Globe Water-meal Ф

Wolffiella lingulata Hegelm. Mud-midget Ф

Wolffiella oblonga (Phil.) Hegelm. Oblong Water-meal Ф

Wyethia ovata T. & G. Mule-ears Ф

Yucca brevifolia var. herbertii (J.M. Webber) Munz Herbert Joshua Tree Ф

Plants Recently Removed from List

Below is a list of taxa that were previously included on this list, but removed after the eleventh (presumed) extant population was found (through either direct field surveys or searches of herbaria records). Only those taxa removed from the current edition are listed below. Consult earlier editions of this checklist for taxa previously removed. A total of 93 taxa were removed since the publication of this checklist in early 2007, of which 25 taxa were removed since the 3 August 2007 edition.

Scientific Name Common Name

Achillea millefolium L. var. arenicola (Heller) Nobs in Ferris Common Island White Yarrow (R)

Achillea millefolium L. var. californica (Pollard) Jepson California White Yarrow (R)

Achillea millefolium L. var. occidentale DC. Woolly White Yarrow (U)

Achillea millefolium L. var. millefolium White Yarrow (U)

Achillea millefolium L. var. pacifica (Rydb.) G.N. Jones Pacific White Yarrow (R)

Agoseris grandiflora (Nutt.) Greene Bigflower [Mountain] Dandelion (U)

Arctostaphylos glandulosa ssp. glaucomollis P. Wells Transverse Ranges Manzanita (U)

Arctostaphylos glandulosa ssp. zacaensis (Eastw.) P. Wells Zaca Lake Manzanita (U)

Carex feta L. Bailey Green-sheathed Sedge Ф

Carex spissa L. Bailey San Diego Sedge Ф

Chamaesyce albomarginata (Torrey & A. Gray) Small Rattlesnake Spurge (U)

Clarkia epilobioides (Nutt.) A. Nels. & J.F. Macbr. Willow-herb Godetia (U)

Cryptantha clevelandii E. Greene Cleveland Forget-Me-Not (U)

Delphinium cardinale Hooker Scarlet or Cardinal Larkspur (U)

Eleocharis geniculata (L.) Roemer & Schultes Geniculate Spike-rush Ф

Eleocharis radicans (Poir.) Kunth Rooted Spike-rush Ф

Eriastrum filifolium (Nutt.) Woot. & Standl. Narrowleaf Woolly Star (R)

Galium nuttallii A. Gray ssp. nuttallii San Diego or Climbing Bedstraw (U)

Lithophragma affine Gray Woodland Star (U)

Malacothamnus orbiculatus (Greene) Greene Roundleaf Bushmallow (R)

Mentzelia pinetorum A.A. Heller Stickleaf (R)

Quercus Xeplingii C.H. Muller White Oak hybrid Ф

Sagittaria longiloba Engelmann Gregg Arrow-head Ф

Salix bonplandiana Kunth. Willow (R)

Viola pedunculata T.& G. ssp. pedunculata Johnny-Jump-Up (U)

Viola sheltonii Torrey Shelton Violet (R)

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[1] This document should be cited as: Magney, D.L. 2008. Checklist of Ventura County Rare Plants. 21 May 2008. California Native Plant Society, Channel Islands Chapter, Ojai, California. (Previous published update dated 3 August 2007.)

[2] California Native Plant Society. 2001. Inventory of Rare and Endangered Plants of California. Sixth edition. (Special Publication No. 1.) Rare Plant Scientific Advisory Committee, David Tibor, Convening Editor, Sacramento, California. September.

[3] Ferren, W.R., Jr., D.L. Magney, and T.A. Sholars. 1995. The Future of California Floristics and Systematics: Collecting Guidelines and Documentation Techniques. Madroño 42(2):197-210.

[4] California Native Plant Society. 2001. Inventory of Rare and Endangered Plants of California. Sixth Edition. Sacramento, California. September.

[5] Ibid.

[6] Buse, John, Esq., Environmental Defense Center, memorandum to David Magney of CNPS dated 14 September 2002.

[7] Scientific name: The complete scientific name is provided for each taxon and consists of the genus, species, and author (person who formally described and named the plant). Underlined entries indicate taxa found only on the Channel Islands (Anacapa or San Nicolas Islands).

[8] Common names are given for all taxa, many of which are invented by the author as no common name has been identified otherwise. “R”, “U”, “Limits”, or “Type” in parentheses indicated the category of rarity: R = rare (formally listed by USFWS, CDFG, CNPS, or with 5 or fewer occurrences in Ventura County); U = uncommon (with 6 to 10 occurrences in Ventura County); Limits = indicate taxon reaches its distribution limits in Ventura County; Type = type locality is within Ventura County.

[9] Taxa that are expected to occur within Ventura County but for which no vouchers have been collected or observed. If any of these taxa are found within Ventura County, they should be considered locally rare species. Plants with a “Ф” following the common name lack vouchers from Ventura County at the following herbaria (CHSC, DAV, IRVC, JEPS, POM, RSA, SBBG, SD, SJSU, UC, UCI, UCR, UCSB, USSC).