Taxon Report

Camissonia integrifolia Raven

Kern River evening-primrose

Print Report

Taxon Summary

Camissonia integrifolia, commonly known as Kern River evening-primrose, is a annual herb in the Onagraceae that is found only in California. It occurs within Chaparral, and Mojavean desert scrub, growing at elevations from 700 to 1200 meters. Camissonia integrifolia is ranked 1B.3, Plants Rare, Threatened or Endangered in California and Elsewhere; Not very threatened in California.

Classification


Scientific Name:	Camissonia integrifolia Raven
Common Name:	Kern River evening-primrose
Family:	Onagraceae
Element Code:	PDONA030T0
USDA Plants Symbol:	CAIN22
Synonyms/Other Names:

Ecology and Life History


Lifeform:	annual herb
Blooming Period: (Apr)May	(Apr)May
Elevation:	700-1200 (2295-3935)
General Habitats:	Chaparral, Mojavean desert scrub
Microhabitat:	Openings, Sandy
Microhabitat Details:	Toeslopes and terraces along drainages

Conservation Status


CA Rare Plant Rank:	1B.3
Global Rank:	G2
State Rank:	S2
State List:	None
Fed List:	None
Other Status:	BLM_S
CRPR Changes:

Occurrence Data from the CNDDB


Total Occurrences:	6
Element Occurrence Ranks:
Excellent (A)	0
Good (B)	0
Fair (C)	1
Poor (D)	0
None (X)	0
Unknown (U)	5

Location


California Endemic: True
California Counties and Islands: Name (Code)
Kern (KRN)
Quads: Name (Quad Code)
Cane Canyon (3511852), Horse Canyon (3511851), Miracle Hot Springs (3511855), Onyx (3511862), Weldon (3511863), Woolstalf Creek (3511853)

Threat List Data from the CNDDB


Threat List Total:	2
EOs with Threat Listed:	Total EOs	% of EOs
	2	33 %
Foot traffic/trampling	1	16%
Road/trail construction/maint.	1	16%

Notes



Rediscovered to science in 2015 after many decades without observation.
Threats:
Potentially threatened by road maintenance.
Taxonomy:

Selected References

Contributions from the U.S. National Herbarium 37(5): 344 (1969)

Fremontia 43(3): 24-25 (2015) [notes on rediscovery]

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].