Taxon Report

Streptanthus glandulosus Hook. ssp. hoffmanii (Kruckeb.) M.S. Mayer & D.W. Taylor

Hoffman's bristly jewelflower

Print Report

Taxon Summary

Streptanthus glandulosus ssp. hoffmanii, commonly known as Hoffman's bristly jewelflower, is a annual herb in the Brassicaceae that is found only in California. It occurs within Chaparral, Cismontane woodland, and Valley and foothill grassland (often serpentinite), growing at elevations from 120 to 475 meters. Streptanthus glandulosus ssp. hoffmanii is ranked 1B.3, Plants Rare, Threatened or Endangered in California and Elsewhere; Not very threatened in California.

Classification


Scientific Name:	Streptanthus glandulosus Hook. ssp. hoffmanii (Kruckeb.) M.S. Mayer & D.W. Taylor
Common Name:	Hoffman's bristly jewelflower
Family:	Brassicaceae
Element Code:	PDBRA2G0J4
USDA Plants Symbol:
Synonyms/Other Names:

Ecology and Life History


Lifeform:	annual herb
Blooming Period: Mar-Jul	Mar-Jul
Elevation:	120-475 (395-1560)
General Habitats:	Chaparral, Cismontane woodland, Valley and foothill grassland
Microhabitat:	Rocky
Microhabitat Details:

Conservation Status


CA Rare Plant Rank:	1B.3
Global Rank:	G4T2
State Rank:	S2
State List:	None
Fed List:	None
Other Status:	BLM_S; SB_UCSC
CRPR Changes:

Occurrence Data from the CNDDB


Total Occurrences:	16
Element Occurrence Ranks:
Excellent (A)	2
Good (B)	2
Fair (C)	2
Poor (D)	0
None (X)	0
Unknown (U)	10

Location


California Endemic: True
California Counties and Islands: Name (Code)
Lake (LAK), Mendocino (MEN), Sonoma (SON)
Quads: Name (Quad Code)
Arched Rock (3812342), Cazadero (3812351), Cold Spring (3912315), Cow Mountain (3912321), Duncans Mills (3812341), Fort Ross (3812352), Hopland (3812381), Jimtown (3812267), Mallo Pass Creek (3912316), The Geysers (3812277), Tombs Creek (3812362), Warm Springs Dam (3812361), Yorkville (3812382)

Threat List Data from the CNDDB


Threat List Total:	3
EOs with Threat Listed:	Total EOs	% of EOs
	3	19 %
Erosion/runoff	2	12%
Logging	1	6%
Road/trail construction/maint.	1	6%

Notes



Historical occurrences need field surveys. See S. glandulosus ssp. secundus in The Jepson Manual. See Madroño 14(7):223 (1958) for original description, and 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].