Taxon Report

Streptanthus glandulosus Hook. ssp. pulchellus (Greene) Kruckeberg

Mt. Tamalpais bristly jewelflower

Print Report

Taxon Summary

Streptanthus glandulosus ssp. pulchellus, commonly known as Mt. Tamalpais bristly 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 150 to 800 meters. Streptanthus glandulosus ssp. pulchellus is ranked 1B.2, Plants Rare, Threatened or Endangered in California and Elsewhere; Moderately threatened in California.

Classification


Scientific Name:	Streptanthus glandulosus Hook. ssp. pulchellus (Greene) Kruckeberg
Common Name:	Mt. Tamalpais bristly jewelflower
Family:	Brassicaceae
Element Code:	PDBRA2G0J2
USDA Plants Symbol:	STGLP
Synonyms/Other Names:

Ecology and Life History


Lifeform:	annual herb
Blooming Period: May-Jul(Aug)	May-Jul(Aug)
Elevation:	150-800 (490-2625)
General Habitats:	Chaparral, Valley and foothill grassland
Microhabitat:	Serpentine
Microhabitat Details:

Conservation Status


CA Rare Plant Rank:	1B.2
Global Rank:	G4T2
State Rank:	S2
State List:	None
Fed List:	None
Other Status:	SB_CalBG/RSABG
CRPR Changes:

Occurrence Data from the CNDDB


Total Occurrences:	24
Element Occurrence Ranks:
Excellent (A)	4
Good (B)	5
Fair (C)	0
Poor (D)	0
None (X)	0
Unknown (U)	15

Location


California Endemic: True
California Counties and Islands: Name (Code)
Marin (MRN)
Quads: Name (Quad Code)
Bolinas (3712286), Inverness (3812217), Novato (3812215), San Geronimo (3812216), San Rafael (3712285)

Threat List Data from the CNDDB


Threat List Total:	9
EOs with Threat Listed:	Total EOs	% of EOs
	11	46 %
Non-native plant impacts	6	25%
Grazing	3	12%
Foot traffic/trampling	2	8%
Other	2	8%
Recreational use (non-ORV)	1	4%
Road/trail construction/maint.	1	4%
Wood cutting or brush clearing	1	4%
Dam/Inundation	1	4%
Erosion/runoff	1	4%

Notes



Known only from the Mt. Tamalpais area. Threatened by trampling and non-native plants. Possibly threatened by browsing. See Systematic Botany 19(4):557-574 (1994) for discussion of S. glandulosus complex.
Threats:

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 5 February 2025].