Taxon Report
Hesperolinon breweri (Gray) SmallBrewer's western flax |
 © 2014 Neal Kramer |
Taxon Summary
Hesperolinon breweri, commonly known as Brewer's 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 30 to 945 meters. Hesperolinon breweri is ranked 1B.2, Plants Rare, Threatened or Endangered in California and Elsewhere; Moderately threatened in California.Classification
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Scientific Name: |
Hesperolinon breweri (Gray) Small |
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Common Name: |
Brewer's western flax |
| Family: | Linaceae |
| Element Code: | PDLIN01030 |
| USDA Plants Symbol: | HEBR4 |
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Synonyms/Other Names: |
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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 |
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State Rank: |
S2 |
| State List: | None |
| Fed List: | None |
| Other Status: | BLM_S |
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CRPR Changes: |
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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 |
| 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% |
Citation
California Native Plant Society, Rare Plant Program. 2025. Rare Plant Inventory (online edition, v9.5.1). Website https://www.rareplants.cnps.org [accessed 30 January 2025].