Taxon Report

Hesperolinon breweri (Gray) Small

Brewer's western flax

Print Report


© 2014 Neal Kramer

  Classification
Scientific Name:
 Hesperolinon breweri (Gray) Small
Common Name:
 Brewer's western flax
Family: Linaceae
Element Code: PDLIN01030
USDA Plants Symbol: HEBR4
Synonyms/Other Names:

Ecology and Life History
Lifeform: annual herb
Blooming Period: May-Jul May-Jul
Elevation: 30-945 (100-3100)
General Habitats: Chaparral, Cismontane woodland, Valley and foothill grassland
Microhabitat: Serpentine (usually)
Microhabitat Details:

Conservation Status
CA Rare Plant Rank: 1B.2
Global Rank: G2
State Rank:
 S2
State List: None
Fed List: None
Other Status: BLM_S
CRPR Changes:

Occurrence Data from the CNDDB
Total Occurrences: 29
Element Occurrence Ranks:
   Excellent (A) 2
   Good (B) 10
   Fair (C) 2
   Poor (D) 1
   None (X) 0
   Unknown (U) 14

Location
California Endemic:  True
California Counties and Islands: Name (Code)
Alameda (ALA), Contra Costa (CCA), Napa (NAP), Solano (SOL)
Quads: Name (Quad Code)
Antioch South (3712187), Brentwood (3712186), Byron Hot Springs (3712176), Capell Valley (3812242), Clayton (3712188), Diablo (3712178), Fairfield North (3812231), Midway (3712165), Monticello Dam (3812251), Mt. George (3812232), Mt. Vaca (3812241), Tassajara (3712177)

Threat List Data from the CNDDB

Threat List Total: 10
EOs with Threat Listed: Total EOs % of EOs
15 52 %
Development 6 20%
Non-native plant impacts 4 13%
Other 3 10%
Foot traffic/trampling 3 10%
Grazing 2 6%
Landfill 2 6%
Recreational use (non-ORV) 2 6%
Road/trail construction/maint. 2 6%
Erosion/runoff 1 3%
Dam/Inundation 1 3%

Notes
Threatened by development, and several occurrences threatened by construction of Los Vaqueros Reservoir. See University of California Publications in Botany 32:235-314 (1961) for taxonomic treatment.
Threats:
Taxonomy:

Selected References

Citation California Native Plant Society, Rare Plant Program. 2024. Rare Plant Inventory (online edition, v9.5.1). Website https://www.rareplants.cnps.org [accessed 25 December 2024].