Taxon Report

Streptanthus oblanceolatus T.W. Nelson and J.P. Nelson

Trinity River jewelflower

Print Report


©2009 Dana York

Taxon Summary

Streptanthus oblanceolatus, commonly known as Trinity River jewelflower, is a perennial herb in the Brassicaceae that is found only in California. It occurs within Cismontane woodland, growing at elevations from 20 to 420 meters. Streptanthus oblanceolatus is ranked 1B.2, Plants Rare, Threatened or Endangered in California and Elsewhere; Moderately threatened in California.

  Classification
Scientific Name:
 Streptanthus oblanceolatus T.W. Nelson and J.P. Nelson
Common Name:
 Trinity River jewelflower
Family: Brassicaceae
Element Code: PDBRA2G500
USDA Plants Symbol: STOB5
Synonyms/Other Names:

Ecology and Life History
Lifeform: perennial herb
Blooming Period: Apr-Jun Apr-Jun
Elevation: 20-420 (65-1380)
General Habitats: Cismontane woodland
Microhabitat: Gravelly, Roadsides, Rock crevices, Rocky, Volcanic
Microhabitat Details: Fissures and soil pockets on exposed rock face and gravel.

Conservation Status
CA Rare Plant Rank: 1B.2
Global Rank: G1
State Rank:
 S1
State List: None
Fed List: None
Other Status: SB_UCSC; USFS_S
CRPR Changes:
  • added to 1B.2 on 2010-01-04

Occurrence Data from the CNDDB
Total Occurrences: 2
Element Occurrence Ranks:
   Excellent (A) 0
   Good (B) 0
   Fair (C) 0
   Poor (D) 0
   None (X) 0
   Unknown (U) 2

Location
California Endemic:  True
California Counties and Islands: Name (Code)
Trinity (TRI)
Quads: Name (Quad Code)
Ironside Mtn. (4012374)

Threat List Data from the CNDDB

Threat List Total: 0
EOs with Threat Listed: Total EOs % of EOs
0 %

 

Notes
Threats:
Potentially threatened by road maintenance.
Taxonomy:

Selected References

Proposed Addition to CRPR 1B.2, G1 / S1 (2010)
Madroño 56(2): 127-129 (2009)
Streptanthus oblanceolatus profile for potential Species of Conservation Concern evaluation (2018)
Citation California Native Plant Society, Rare Plant Program. 2025. Rare Plant Inventory (online edition, v9.5.1). Website https://www.rareplants.cnps.org [accessed 29 October 2025].