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Taxon  Report  
Hesperolinon congestum  (A. Gray) Small
Marin dwarf flax,   Marin western flax
Hesperolinon congestum is an annual herb that is native to California, and endemic (limited) to California.
California Rare Plant Rank: 1B.1 (rare, threatened, or endangered in CA and elsewhere).
State of California status: Threatened. Federal status: Threatened.
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Observation Search
~157 records in California
yellowone or more occurrences
within a 7.5-minute quadrangle
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Bloom Period
Genus: Hesperolinon
Family: Linaceae  
Category: angiosperm  
PLANTS group:Dicot
Jepson eFlora section: eudicot

Ultramafic affinity: 6 - strict endemic

Communities: Chaparral, Valley Grassland

Name Status:
Accepted by JEF + CNPS + PLANTS
Alternate Names:
PLANTSLinum californicum var. congestum
JEF + PLANTSLinum congestum
POWOLinum congestum
Information about  Hesperolinon congestum from other sources
Nursery availability from CNPLX
Commercial availability unknown.
Jepson eFlora

USDA PLANTS Profile (HECO12)

Photos on Calflora

Photos on CalPhotos

Google Images

Photos on iNaturalist

ID Tips on PlantID.net

[Wikipedia] Limited Range, Habitat: Hesperolinon congestum, or Marin dwarf flax, is an annual herb, which is known to occur only in San Mateo, San Francisco and Marin County, California,[1] United States. This plant occurs chiefly on serpentine soils, especially in dry native bunch grasses, chaparral or other grasslands at elevations less than 200 meters. (link added by Mary Ann Machi)


Suggested Citation
Calflora: Information on California plants for education, research and conservation, with data contributed by public and private institutions and individuals. [web application]. 2025. The Calflora Database [a non-profit organization]. Available: https://www.calflora.org/   (Accessed: 07/09/2025).