Taxon Details

Hesperolinon didymocarpum

Lake County western flax

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Taxon Summary:

Hesperolinon didymocarpum, commonly known as Lake County western flax, is a annual herb in the Linaceae that is found only in California. It occurs within Chaparral, Cismontane woodland, and Valley and foothill grassland, growing at elevations from 330 to 365 meters. Hesperolinon didymocarpum is ranked 1B.2, Plants Rare, Threatened or Endangered in California and Elsewhere; Moderately threatened in California.

Classification

Scientific Name: Hesperolinon didymocarpum H.K. Sharsm.
Common Name: Lake County western flax
Family:	Linaceae
Element Code:	PDLIN01070
USDA Plants Symbol:	HEDI3
Synonyms/Other Names:
Name Status:	JEF, FNA, POWO, IPNI, Tropicos

Conservation Status

CA Rare Plant Rank:	1B.2
Fed List:	None
State List:	CE (1981-08-01)
Global Rank:	G1
State Rank:	S1
Other Status:	BLM_S; SB_UCSC
CRPR Changes:
Add Date:	1974-01-01
Date Edited:	2024-11-05

Ecology and Life History

Lifeform: annual herb

Blooming Period: May-Jul

Elevation:
330 - 365 meters
1085 - 1200 feet

General Habitats:

Chaparral
Cismontane woodland
Valley and foothill grassland

Microhabitat Details:

Microhabitat:

Serpentine

Notes

Notes: Known from fewer than ten occurrences in the Big Cyn. area near Middletown. Potentially threatened by grazing, agriculture, and urbanization. See University of California Publications in Botany 32:235-314 (1961) for original description.
Threats:
Taxonomy:

Threat List Data from the CNDDB

THREAT LIST:
Threat List Total:	5
	Total EOs	% of EOs
EOs with Threat Listed:	4	67 %
Grazing	3	50%
Other	1	16%
Recreational use (non-ORV)	1	16%
Dam/Inundation	1	16%
Erosion/runoff	1	16%

Occurrence Data from the CNDDB

Element Occurrence Ranks:
Total Occurrences:					6
A	B	C	D	X	U
0	2	2	0	0	2

Occurrence Status:
Historical >20 Years	5
Recent <=20 Years	1

Presence:
Presumed Extant	6
Possibly Extirpated	0
Presumed Extirpated	0

Location

California Endemic:

California Island:

States: Name (Code)
California (CA)

California Counties and Islands: Name (Code)
Lake (LAK)

Quads: Name (Quad Code)
Middletown (3812275)

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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CNPS Rare Plant Inventory