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.
[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)
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: 03/28/2025).
one or more occurrences