Hesperolinon californicum

California dwarf flax

Family:Linaceae

Rarity

CNPS-EB: B-PV

15 current natural populations

Criteria:

Limited/Threatened Habitat
Narrow Range in ALA & CCA

Observations

CNPS-EB Database ⓘ
Calflora (group) ⓘ
Calflora (public)
iNaturalist
- Genus Hesperolinon
- Hesperolinon californicum
CCH2

Key

Ecology

Flowers April - July

Habitats:

Grassland (Annual or Perennial)
Rock, Tallus, Scree
Serpentine or Serpentine-derived soils

All Hesperolinon

H. breweri (*A2)
H. californicum
H. clevelandii (A1)
H. disjunctum (A1)
H. micranthum (A2)
H. tehamense (*A1?)

References

Populations

Key

Location	Pop ID	Last Recorded	Notes
Briones Reservoir, EBMUD	20	2025-05-26
Corral Hollow Area	3	2004-08-31
Fairmont Ridge, near Lake Chabot	14	2020-06-06
Lawrence Livermore Lab, Site 300, Corral Hollow	4	2021-12-31
Lime Ridge area	15	2024-05-27
Mt. Diablo State Park - North side	6	2022-04-30
Mt. Diablo State Park - South side	9	2003-06-30
Mt. Diablo State Park - South side	10	2022-05-22
Mt. Diablo State Park - West of Mt. Zion	7	2003-06-30
Mt. Diablo State Park - West side	12	2021-05-19
Mt. Diablo State Park - West side	13	2006-06-13
Mt. Diablo State Park - West side	19	2022-06-04
Ohlone Rgnl Wilderness	17	2020-05-22
Ohlone Rgnl Wilderness	18	2020-05-23
Tesla, Corral Hollow	2	2015-03-31
Corral Hollow Area	1	1939-05-27	Historic
Mt. Diablo State Park - East side	5	1904-06-23	Historic
Mt. Diablo State Park - South side	8	1933-12-31	Historic
Mt. Diablo State Park - South side	11	1999-12-31	Historic
Norris Canyon	16	1976-12-31	Historic

The list of populations shows the distinct populations identified by the CNPS-EB Rare and Unusual Plants Committee. The locations in this list are very general. More specific location details can be obtained from the links in the Observations section (for some of these links, a login is required).

Font

Populations in bold type have precise coordinates available for field volunteers and researchers.

Populations in normal type are only known from a description of the location; no precise coordinates are available.

Background

Populations with a white background have been observed in the last 25 years.

Populations with a blue background have not been observed for at least 25 years.

Populations with an orange background have an uncertain location or identification, or are planted.

Columns

Pop ID is a label that identifies the population. Many locations have more than one population of a species, and the population ID is used to distinguish them.