Taxon Report

Psorothamnus fremontii (Gray) Barneby var. attenuatus Barneby

narrow-leaved psorothamnus

Print Report

Taxon Summary

Psorothamnus fremontii var. attenuatus, commonly known as narrow-leaved psorothamnus, is a perennial shrub in the Fabaceae that is found in California and elsewhere. It occurs within Sonoran desert scrub (granitic, and volcanic), growing at elevations from 335 to 915 meters. Psorothamnus fremontii var. attenuatus is ranked 2B.3, Plants Rare, Threatened, or Endangered in California, But More Common Elsewhere; Not very threatened in California.

Classification


Scientific Name:	Psorothamnus fremontii (Gray) Barneby var. attenuatus Barneby
Common Name:	narrow-leaved psorothamnus
Family:	Fabaceae
Element Code:	PDFAB3C031
USDA Plants Symbol:	PSFRA
Synonyms/Other Names:

Ecology and Life History


Lifeform:	perennial shrub
Blooming Period: Apr	Apr
Elevation:	335-915 (1100-3000)
General Habitats:	Sonoran desert scrub
Microhabitat:
Microhabitat Details:

Conservation Status


CA Rare Plant Rank:	2B.3
Global Rank:	G5T4?
State Rank:	S3
State List:	None
Fed List:	None
Other Status:
CRPR Changes:	changed from 2.3 to 2B.3 on 2013-06-12

Occurrence Data from the CNDDB


Total Occurrences:	21
Element Occurrence Ranks:
Excellent (A)	16
Good (B)	3
Fair (C)	0
Poor (D)	0
None (X)	0
Unknown (U)	2

Location


California Endemic: False
California Counties and Islands: Name (Code)
San Bernardino (SBD)
Quads: Name (Quad Code)
Chemehuevi Peak (3411455), Gene Wash (3411432), Monumental Pass (3411466), Savahia Peak (3411435), Whipple Mts. SW (3411434), Whipple Wash (3411433)

Threat List Data from the CNDDB


Threat List Total:	3
EOs with Threat Listed:	Total EOs	% of EOs
	10	48 %
Road/trail construction/maint.	5	23%
Mining	3	14%
Development	2	9%

Notes



Known in CA only from the Whipple Mtns. See Memoirs of the New York Botanical Garden 27:41 (1977) for original description.
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 30 September 2025].