CNPS.ORG Inventory of Rare and Endangered Plants - 7th edition interface
v7-18mar 3-19-18
Status: record horkelia_tenuiloba - Sun, Dec. 5, 2021, 05:59 ET b
Horkelia tenuiloba
common namethin-lobed horkelia
CalPhotos image
more photos
Doreen L. Smith © 1994 Doreen L. Smith  Follow image link for photo data.
life formperennial herb
CA Rare Plant Rank
List 1B.2
LIST 1B: Rare, threatened, or endangered in California and elsewhere.
     0.2: Fairly endangered in California
state rank
S2      ranking system key
global rank
G2     G2: 6-20 occurrences OR 1,000-3,000 individuals OR 2,000-10,000 acres
Where did the "RED" code go?
CA state listingNone  
federal listingNone  
where found
MAPS - Use v8 link below.

Topographic quads (15):
San Rafael (467A) 3712285, Bolinas (467B) 3712286, Sonoma (500C) 3812234, Sebastopol (502A) 3812247, Camp Meeker (502B) 3812248, Duncans Mills (503A) 3812341, Geyserville (518B) 3812268, Guerneville (518C) 3812258, Annapolis (520A) 3812363, Plantation (520D) 3812353, Mcguire Ridge (536C) 3812374, Point Arena (537B) 3812386, Saunders Reef (537C) 3812376, Gualala (537D) 3812375, Willis Ridge (583D) 3912353
quad data info

Counties, states, regions:
Mendocino (MEN), Marin (MRN), Sonoma (SON)
A reminder: Species not recorded for a given area may nonetheless be present, especially where favorable conditions occur.
CNPS habitats•Broadleafed upland forest (BUFrs)
•Chaparral (Chprl)
•Valley and foothill grassland (VFGrs)/mesic openings, sandy
blooming period May-Jul(Aug),   Months in parentheses are uncommon.
elevation range50 - 500 meters
Historical occurrences need field surveys. Threatened by development. Possibly threatened by foot traffic, trail maintenance, logging, and non-native plants. See Report of the Pacific Railroad Expedition 4(5):84 (1857) for original description, and Systematic Botany 18(1):137-144 (1993) for taxonomic treatment.
full nameHorkelia tenuiloba (Torr.) Gray
Version 8    INVENTORY VERSION 8 interface for this taxon, including GIS and more links

Additional information:
standard acronym  HOTE2 Element Code  PDROS0W0E0
CalFlora species this taxon    CalFlora genus related taxa
Jepson Online Jepson Interchange  Jepson Manual and other resources
Google search
search Google CNPS website    search Google entire web

Suggested citation: California Native Plant Society (CNPS). 2018. Inventory of Rare and Endangered Plants (online edition, v7-18mar). California Native Plant Society. Sacramento, CA. Accessed on Sun, Dec. 5, 2021 from

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