CNPS

CNPS Rare Plant Inventory

Species Details

Streptanthus brachiatus ssp. brachiatus

Socrates Mine jewelflower

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  Classification

Scientific Name:
Streptanthus brachiatus F.W. Hoffm. ssp. brachiatus
Common Name:
Socrates Mine jewelflower
Family: Brassicaceae
Element Code: PDBRA2G072
USDA Plants Symbol: STBRB
Synonyms/Other Names:

  Conservation Status

CA Rare Plant Rank: 1B.2
Fed List: None
State List: None
Global Rank: G2T1
State Rank:
 S1
Other Status: BLM_S
CRPR Changes:
Add Date: 1980-01-01
Date Edited: 2022-06-08

  Ecology and Life History

Lifeform: perennial herb
Blooming Period: May-Jun
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Elevation:
545 - 1000 meters
1790 - 3280 feet
General Habitats:
  • Closed-cone coniferous forest
  • Chaparral
Microhabitat Details:
Microhabitat:
  • Serpentine (usually)

  Notes

Notes:
Known from fewer than ten occurrences. Plants from LAK Co. (517B, 533C) are more appropriately assigned to S. brachiatus ssp. hoffmanii. Possibly threatened by alteration of fire regimes. See Madroño 36(1):36 (1989) for revised nomenclature.
Threats:
Taxonomy:

  Threat List Data from the CNDDB

Threat List Total: 4
Total EOs % of EOs
EOs with Threat Listed: 4 40 %
THREAT LIST:
Mining 3 30%
Road/trail construction/maint. 2 20%
Development 1 10%
ORV activity 1 10%

  Occurrence Data from the CNDDB

Total Occurrences: 10
Element Occurrence Ranks:
A B C D X U
1 3 0 0 0 6
Occurrence Status:
Historical >20 Years 8
Recent <=20 Years 2
Presence:
Presumed Extant 10
Possibly Extirpated 0
Presumed Extirpated 0

  Location

California Endemic:
California Island:
States: Name (Code)
California (CA)
California Counties and Islands: Name (Code)
Lake (LAK), Napa (NAP), Sonoma (SON)
Quads: Name (Quad Code)
Detert Reservoir (3812265), The Geysers (3812277), Whispering Pines (3812276)
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

Suggested Citation:
California Native Plant Society, Rare Plant Program. 2024. Rare Plant Inventory (online edition, v9.5). Website https://www.rareplants.cnps.org [accessed 21 November 2024].