Taxon Report

Streptanthus hispidus Gray

Mt. Diablo jewelflower

Print Report


© 2011 Aaron Schusteff

Taxon Summary

Streptanthus hispidus, commonly known as Mt. Diablo jewelflower, is a annual herb in the Brassicaceae that is found only in California. It occurs within Chaparral, and Valley and foothill grassland, growing at elevations from 365 to 1200 meters. Streptanthus hispidus is ranked 1B.3, Plants Rare, Threatened or Endangered in California and Elsewhere; Not very threatened in California.

  Classification
Scientific Name:
 Streptanthus hispidus Gray
Common Name:
 Mt. Diablo jewelflower
Family: Brassicaceae
Element Code: PDBRA2G0M0
USDA Plants Symbol: STHI2
Synonyms/Other Names:

Ecology and Life History
Lifeform: annual herb
Blooming Period: Mar-Jun Mar-Jun
Elevation: 365-1200 (1200-3935)
General Habitats: Chaparral, Valley and foothill grassland
Microhabitat: Rocky
Microhabitat Details:

Conservation Status
CA Rare Plant Rank: 1B.3
Global Rank: G2
State Rank:
 S2
State List: None
Fed List: None
Other Status: SB_CalBG/RSABG
CRPR Changes:

Occurrence Data from the CNDDB
Total Occurrences: 8
Element Occurrence Ranks:
   Excellent (A) 0
   Good (B) 4
   Fair (C) 3
   Poor (D) 1
   None (X) 0
   Unknown (U) 0

Location
California Endemic:  True
California Counties and Islands: Name (Code)
Contra Costa (CCA)
Quads: Name (Quad Code)
Clayton (3712188), Diablo (3712178)

Threat List Data from the CNDDB

Threat List Total: 6
EOs with Threat Listed: Total EOs % of EOs
7 88 %
Foot traffic/trampling 7 87%
Other 3 37%
Road/trail construction/maint. 3 37%
Recreational use (non-ORV) 1 12%
Non-native animal impacts 1 12%
Non-native plant impacts 1 12%

Notes
Threats:

Possibly threatened by foot traffic.
Taxonomy:

Selected References

Citation California Native Plant Society, Rare Plant Program. 2025. Rare Plant Inventory (online edition, v9.5.1). Website https://www.rareplants.cnps.org [accessed 31 January 2025].