CNPS Inventory Plant Detail

Hesperolinon congestum

Common Name:	Marin western flax
Family:	Linaceae
Synonyms:
Element Code:	PDLIN01060
Full Name:	Hesperolinon congestum (Gray) Small
USDA PLANTS Symbol:	HECO12

Biology
Lifeform: annual herb Blooming Period: April - July Habitat: serpentinite. • Chaparral • Valley and foothill grassland

Rarity Status
CA Rare Plant Rank: 1B.1 Rare, threatened, or endangered in California and elsewhere .1: Seriously endangered in California Federal Listing Status: FT Threatened (02/03/95) State Listing Status: CT Threatened (06/92) State Rank: S2 S2: Imperiled. Global Rank: G2 G2: Imperiled.

Occurrence Data from DFG
California Natural Diversity Database

Total # of Known Element Occurrences: 27
Element Occurrence Ranks:

A B C D X U

3 9 8 1 4 2

Population Status:

Historic >20 yrs	Recent <=20 yrs
9	18

Presence:

Present Extant	Possibly Extirpated	Extirpated
23	1	3

Notes

Protected in part at Ring Mtn. Preserve, MRN Co. Threatened by development, non-native plants, and foot traffic. See Proceedings of the American Academy of Arts and Sciences 6:521 (1865) for original description, and University of California Publications in Botany 32:235-314 (1961) 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: 1974-01-01
Last Update: 2010-03-15

Location

Elevation: 5 - 370 meters

California Endemic: yes

States: California

California Counties and Islands: name (code)
Marin (MRN), San Francisco (SFO), San Mateo (SMT)

Quads: name (DWR code) USGS code
Palo Alto (428B) 37122D2, Woodside (429A) 37122D3, San Mateo (448D) 37122E3, San Quentin (466B) 37122H4, San Francisco North (466C) 37122G4, San Rafael (467A) 37122H5, Bolinas (467B) 37122H6, Petaluma River (484A) 38122B5, San Geronimo (484C) 38122A6, Novato (484D) 38122A5

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

405

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 .

-122.375,37.75