CNPS.ORG Inventory of Rare and Endangered Plants - 7th edition interface
v7-18mar 3-19-18
Status: record horkelia_bolanderi - Mon, Dec. 6, 2021, 22:08 ET b
Horkelia bolanderi
common nameBolander's horkelia
CalPhotos image
more photos
Brother Alfred Brousseau © 1995 Saint Mary's College of California  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
S1      ranking system key
global rank
G1     G1: Less than 6 occurrences OR less than 1,000 individuals OR less than 2,000 acres.
Where did the "RED" code go?
CA state listingNone  
federal listingNone  
where found
MAPS - Use v8 link below.

Topographic quads (10):
Monument Peak (019B) 3211684, San Jacinto Peak (083C) 3311676, Keller Peak (106A) 3411721, Clearlake Highlands (533B) 3812286, Whispering Pines (533C) 3812276, Kelseyville (534A) 3812287, Highland Springs (534B) 3812288, Leesville (547B) 3912224, Purdys Gardens (550D) 3912311, Potato Hill (565D) 3912237
quad data info

Counties, states, regions:
Colusa (COL)*, Lake (LAK), Mendocino (MEN)
A reminder: Species not recorded for a given area may nonetheless be present, especially where favorable conditions occur.
CNPS habitats•Chaparral (Chprl)
•Lower montane coniferous forest (LCFrs)
•Meadows and seeps (Medws)
•Valley and foothill grassland (VFGrs)/edges, vernally mesic areas
blooming period (May),Jun-Aug   Months in parentheses are uncommon.
elevation range450 - 1100 meters
Threatened by vehicles. Possibly threatened by development, road widening, hydrological alterations, and non-native plants. See Systematic Botany 18(1):137-144 (1993) for taxonomic treatment.
full nameHorkelia bolanderi Gray
Version 8    INVENTORY VERSION 8 interface for this taxon, including GIS and more links

Additional information:
standard acronym  HOBO2 Element Code  PDROS0W010
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 Mon, Dec. 6, 2021 from

pick and add to Plant Pressexplain the meaning of the fieldsFIRSTPREVIOUSNEXTLASTCNPS.ORGQuestions and CommentsHOMELOGIN (you are guest anonymous)   Web Oriented Database Home