Taxon Details

Streptanthus brachiatus ssp. brachiatus

Socrates Mine jewelflower

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Taxon Summary:

Streptanthus brachiatus ssp. brachiatus, commonly known as Socrates Mine jewelflower, is a perennial herb in the Brassicaceae that is found only in California. It occurs within Chaparral, and Closed-cone coniferous forest, growing at elevations from 545 to 1000 meters. Streptanthus brachiatus ssp. brachiatus is ranked 1B.2, Plants Rare, Threatened or Endangered in California and Elsewhere; Moderately threatened in California.

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:
Name Status:	JEF, FNA, POWO, IPNI, Tropicos

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

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

Occurrence Data from the CNDDB

Element Occurrence Ranks:
Total Occurrences:					10
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

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CNPS Rare Plant Inventory