CNPS Inventory Plant Detail

Horkelia bolanderi

Common Name:	Bolander's horkelia
Family:	Rosaceae
Synonyms:
Element Code:	PDROS0W010
Full Name:	Horkelia bolanderi Gray
USDA PLANTS Symbol:	HOBO2

Biology
Lifeform: perennial herb Blooming Period: June - August Habitat: edges, vernally mesic areas. • Chaparral • Lower montane coniferous forest • Meadows and seeps • Valley and foothill grassland

Rarity Status
CA Rare Plant Rank: 1B.2 Rare, threatened, or endangered in California and elsewhere .2: Fairly endangered in California Federal Listing Status: Not Listed State Listing Status: Not Listed State Rank: S1 S1: Critically Imperiled. Global Rank: G1 G1: Critically Imperiled.

Occurrence Data from DFG
California Natural Diversity Database

Total # of Known Element Occurrences: 10
Element Occurrence Ranks:

A B C D X U

2 4 0 0 1 3

Population Status:

Historic >20 yrs	Recent <=20 yrs
7	3

Presence:

Present Extant	Possibly Extirpated	Extirpated
9	1	0

Notes
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. To submit rare plant observation data, use the CNDDB field survey form. Please see also the CNPS Rare Plant Data page. Date Added: 1988-01-01 Last Update: 2012-05-17

Location

Elevation: 450 - 1100 meters

California Endemic: yes

States: California

California Counties and Islands: name (code)
Colusa (COL) *, Lake (LAK), Mendocino (MEN)

Quads: name (DWR code) USGS code
Clearlake Highlands (533B) 38122H6, Whispering Pines (533C) 38122G6, Kelseyville (534A) 38122H7, Highland Springs (534B) 38122H8, Leesville (547B) 39122B4, Purdys Gardens (550D) 39123A1, Potato Hill (565D) 39122C7

Notes:

Definitions of codes preceding a county and/or quad:
*		Presumed extirpated
?		Uncertain about distribution or identity
?*		Uncertain about distribution, but presumed extirpated if once present
(?)		Occurrence confirmed, but possibly extirpated

Species may be present in other areas where conditions are favorable.

Presumed Extant

Presumed Extirpated or Unknown

908

Links to Leading Resources of Taxon Information
USDA PLANTS Calflora CalPhotos Consortium of California Herbaria California Department of Fish and Game: CNDDB Quick Viewer

Suggested Citation
California Native Plant Society (CNPS). Inventory of Rare and Endangered Plants (online edition, v8-01a). California Native Plant Society. Sacramento, CA. Accessed on .

-122.75,38.875