CNPS

CNPS Rare Plant Inventory



Taxon Details

Streptanthus oblanceolatus

Trinity River jewelflower

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Photo of Streptanthus oblanceolatus
©2009 Dana York 		Photo of Streptanthus oblanceolatus
©2009 Dana York 		Photo of Streptanthus oblanceolatus
©2010 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:
Name Status: JEF, FNA, POWO,
IPNI, Tropicos

  Conservation Status

CA Rare Plant Rank: 1B.2
Fed List: None
State List: None
Global Rank: G1
State Rank:
 S1
Other Status:
CRPR Changes:
added to 1B.2 on 2010-01-04
Add Date: 2010-01-04
Date Edited: 2025-07-07

  Ecology and Life History

Lifeform: perennial herb
Blooming Period: Apr-Jun
JFMAMJJASOND
Elevation:
20 - 420 meters
65 - 1380 feet
General Habitats:
  • Cismontane woodland
Microhabitat Details: Fissures and soil pockets on exposed rock face and gravel.
Microhabitat:
  • Gravelly
  • Roadsides
  • Rock crevices
  • Rocky
  • Volcanic

  Notes

Notes:
Threats:
Potentially threatened by road maintenance.
Taxonomy:

  Threat List Data from the CNDDB

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

 

  Occurrence Data from the CNDDB

Total Occurrences: 2
Element Occurrence Ranks:
A B C D X U
0 0 0 0 0 2
Occurrence Status:
Historical >20 Years 1
Recent <=20 Years 1
Presence:
Presumed Extant 2
Possibly Extirpated 0
Presumed Extirpated 0

  Location

California Endemic:
California Island:
States: Name (Code)
California (CA)
California Counties and Islands: Name (Code)
Trinity (TRI)
Quads: Name (Quad Code)
Ironside Mtn. (4012374)
Notes:
Definitions of codes following a county and/or quad:
* Presumed extirpated
(?) Occurrence confirmed, but possibly extirpated
Quad and county data is imported from the CNDDB. Species may be present in other areas where conditions are favorable. These data should NOT be substituted for pre-project review or for on-site surveys.
Regional Map

  Map

Presumed Extant
Click on quad for name. Hold Shift Key to use mouse scroll wheel

  Selected References

CNPS Status Review: Proposed Addition to CRPR 1B.2, G1 / S1 (2010)
Original Description: Madroño 56(2): 127-129 (2009)
Species Account: Streptanthus oblanceolatus profile for potential Species of Conservation Concern evaluation (2018)

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Suggested Citation:
California Native Plant Society, Rare Plant Program. 2025. Rare Plant Inventory (online edition, v9.5.1). Website https://www.rareplants.cnps.org [accessed 20 July 2025].
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