Taxon Report

Chylismia claviformis (Torr. & Frem.) A. Heller ssp. cruciformis (Kellogg) W.L. Wagner & Hoch

cruciform evening-primrose

Print Report

Taxon Summary

Chylismia claviformis ssp. cruciformis, commonly known as cruciform evening-primrose, is a annual herb in the Onagraceae that is found in California and elsewhere. It occurs within Chenopod scrub, and Great Basin scrub, growing at elevations from 600 to 1400 meters. Chylismia claviformis ssp. cruciformis is ranked 2B.3, Plants Rare, Threatened, or Endangered in California, But More Common Elsewhere; Not very threatened in California.

Classification


Scientific Name:	Chylismia claviformis (Torr. & Frem.) A. Heller ssp. cruciformis (Kellogg) W.L. Wagner & Hoch
Common Name:	cruciform evening-primrose
Family:	Onagraceae
Element Code:	PDONA030D4
USDA Plants Symbol:
Synonyms/Other Names:	Camissonia claviformis ssp. cruciformis

Ecology and Life History


Lifeform:	annual herb
Blooming Period: May-Jul	May-Jul
Elevation:	600-1400 (1970-4595)
General Habitats:	Chenopod scrub, Great Basin scrub
Microhabitat:	Clay
Microhabitat Details:

Conservation Status


CA Rare Plant Rank:	2B.3
Global Rank:	G5T4
State Rank:	S2
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:	25
Element Occurrence Ranks:
Excellent (A)	0
Good (B)	3
Fair (C)	4
Poor (D)	0
None (X)	0
Unknown (U)	18

Location


California Endemic: False
California Counties and Islands: Name (Code)
Lassen (LAS), Modoc (MOD)
Quads: Name (Quad Code)
Hays Canyon (4111938), Calneva Lake (4012021), Cherry Mtn. (4012051), Doyle (4012011), Eagleville (4112031), Five Springs (4012052), Karlo (4012053), Likely (4112025), Little Mud Flat (4012042), Shaffer Mtn. (4012043), Spencer Creek (4012031), Wendel (4012032)

Threat List Data from the CNDDB


Threat List Total:	3
EOs with Threat Listed:	Total EOs	% of EOs
	15	60 %
Other	12	48%
Road/trail construction/maint.	2	8%
Grazing	2	8%

Notes



See Proceedings of the California Academy of Sciences 2:227 (1863) for original description, Brittonia 16:282 (1964) for revised nomenclature, and Contributions from the U.S. National Herbarium 37:213-214 (1969) for taxonomic treatment.
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 2 May 2025].