CNPS

CNPS Rare Plant Inventory



Species Details

Hesperolinon drymarioides

drymaria-like western flax

  View Report   Copy Link Calflora eFlora CCH CalPhotos iNaturalist
Photo of Hesperolinon drymarioides
© Niall McCarten and CNPS 		Photo of Hesperolinon drymarioides
© 1998 John Game 		Photo of Hesperolinon drymarioides
© 2013 Jake Ruygt

Species Description:

Hesperolinon drymarioides, commonly known as drymaria-like western flax, is a annual herb in the Linaceae that is found only in California. It occurs within Chaparral, Cismontane woodland, Closed-cone coniferous forest, and Valley and foothill grassland, growing at elevations from 100 to 1130 meters. Hesperolinon drymarioides is ranked 1B.2, Plants Rare, Threatened or Endangered in California and Elsewhere; Moderately threatened in California.

  Classification

Scientific Name:
Hesperolinon drymarioides (Curran) Small
Common Name:
drymaria-like western flax
Family: Linaceae
Element Code: PDLIN01090
USDA Plants Symbol: HEDR4
Synonyms/Other Names:
Name Status: JEP, FNA, POWO,
IPNI, Tropicos

  Conservation Status

CA Rare Plant Rank: 1B.2
Fed List: None
State List: None
Global Rank: G2
State Rank:
 S2
Other Status: BLM_S; USFS_S
CRPR Changes:
Add Date: 1974-01-01
Date Edited: 2022-03-01

  Ecology and Life History

Lifeform: annual herb
Blooming Period: May-Aug
JFMAMJJASOND
Elevation:
100 - 1130 meters
330 - 3710 feet
General Habitats:
  • Closed-cone coniferous forest
  • Chaparral
  • Cismontane woodland
  • Valley and foothill grassland
Microhabitat Details:
Microhabitat:
  • Serpentine

  Notes

Notes:
Threats:

Threatened by mining and vehicles, and potentially threatened by renewable energy development.
Taxonomy:

  Threat List Data from the CNDDB

Threat List Total: 5
Total EOs % of EOs
EOs with Threat Listed: 14 58 %
THREAT LIST:
Development 6 25%
Road/trail construction/maint. 5 20%
ORV activity 4 16%
Mining 2 8%
Wood cutting or brush clearing 1 4%

  Occurrence Data from the CNDDB

Total Occurrences: 24
Element Occurrence Ranks:
A B C D X U
6 8 7 0 0 3
Occurrence Status:
Historical >20 Years 11
Recent <=20 Years 13
Presence:
Presumed Extant 24
Possibly Extirpated 0
Presumed Extirpated 0

  Location

California Endemic:
California Island:
States: Name (Code)
California (CA)
California Counties and Islands: Name (Code)
Colusa (COL), Glenn (GLE), Lake (LAK), Napa (NAP)
Quads: Name (Quad Code)
Elk Mountain (3912238), Gilmore Peak (3912235), Hough Springs (3912225), Jericho Valley (3812274), Knoxville (3812273), Leesville (3912224), Potato Hill (3912237), St. John Mtn. (3912246), Stonyford (3912245), Wilbur Springs (3912214), Wilson Valley (3812284)
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
Click on quad for name. Hold Shift Key to use mouse scroll wheel

  Selected References

Original Description: Bulletin of the California Academy of Sciences 1:152 (1885)
Taxonomic Treatment: University of California Publications in Botany 32:235-314 (1961)
Species Account: Hesperolinon drymarioides profile for potential Species of Conservation Concern evaluation (2018)
Other: USFS Potential Species of Conservation Concern Profile

Go to top


Suggested Citation:
California Native Plant Society, Rare Plant Program. 2025. Rare Plant Inventory (online edition, v9.5.1). Website https://www.rareplants.cnps.org [accessed 14 January 2025].
}