Species Details

Horkelia bolanderi

Bolander's horkelia

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Classification

Scientific Name: Horkelia bolanderi Gray
Common Name: Bolander's horkelia
Family:	Rosaceae
Element Code:	PDROS0W011
USDA Plants Symbol:	HOBO2
Synonyms/Other Names:

Conservation Status

CA Rare Plant Rank:	1B.2
Fed List:	None
State List:	None
Global Rank:	G1
State Rank:	S1
Other Status:	BLM_S
CRPR Changes:
Add Date:	1988-01-01
Date Edited:	2022-03-01

Ecology and Life History

Lifeform: perennial herb

Blooming Period: (May)Jun-Aug

Elevation:
450 - 1100 meters
1475 - 3610 feet

General Habitats:

Chaparral
Lower montane coniferous forest
Meadows and seeps
Valley and foothill grassland

Microhabitat Details:

Microhabitat:

Edges
Vernally Mesic

Notes

Notes:
Threats: Threatened by vehicles. Possibly threatened by development, road widening, hydrological alterations, and non-native plants.
Taxonomy:

Threat List Data from the CNDDB

THREAT LIST:
Threat List Total:	11
	Total EOs	% of EOs
EOs with Threat Listed:	10	77 %
Non-native plant impacts	4	30%
Road/trail construction/maint.	4	30%
Agriculture	2	15%
Altered flood/tidal/hydrologic regime	2	15%
Dam/Inundation	1	7%
Development	1	7%
Erosion/runoff	1	7%
Foot traffic/trampling	1	7%
Improper burning regime	1	7%
Surface water diversion	1	7%
ORV activity	1	7%

Occurrence Data from the CNDDB

Element Occurrence Ranks:
Total Occurrences:					13
A	B	C	D	X	U
3	6	0	0	1	3

Occurrence Status:
Historical >20 Years	6
Recent <=20 Years	7

Presence:
Presumed Extant	12
Possibly Extirpated	1
Presumed Extirpated	0

Location

California Endemic:

California Island:

States: Name (Code)
California (CA)

California Counties and Islands: Name (Code)
Colusa (COL), Lake (LAK), Mendocino (MEN)

Quads: Name (Quad Code)
Benmore Canyon (3912215), Clearlake Highlands (3812286), Highland Springs (3812288), Hough Springs (3912225), Kelseyville (3812287), Leesville (3912224), Manor Slough (3912223), Potato Hill (3912237), Purdys Gardens (3912311), Salt Canyon (3912213), Whispering Pines (3812276), Wilbur Springs (3912214)

Notes:

Definitions of codes following a county and/or quad:
*		Presumed extirpated
(?)		Occurrence confirmed, but possibly extirpated
Quad and county data is imported from the CNDDB. Species may be present in other areas where conditions are favorable. These data should NOT be substituted for pre-project review or for on-site surveys.

Regional Map

Map

Presumed Extant

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Selected References

Taxonomic Treatment:	Systematic Botany 18(1):137-144 (1993)
Species Account:	Horkelia bolanderi profile for potential Species of Conservation Concern evaluation (2018)
Other:	USFS Potential Species of Conservation Concern Profile