Taxon Report

Trifolium jokerstii Vincent & R. Morgan

Butte County golden clover

Print Report

Taxon Summary

Trifolium jokerstii, commonly known as Butte County golden clover, is a annual herb in the Fabaceae that is found only in California. It occurs within Valley and foothill grassland (mesic), and Vernal pools, growing at elevations from 50 to 480 meters. Trifolium jokerstii is ranked 1B.2, Plants Rare, Threatened or Endangered in California and Elsewhere; Moderately threatened in California.

Classification


Scientific Name:	Trifolium jokerstii Vincent & R. Morgan
Common Name:	Butte County golden clover
Family:	Fabaceae
Element Code:	PDFAB40310
USDA Plants Symbol:	TRJO
Synonyms/Other Names:

Ecology and Life History


Lifeform:	annual herb
Blooming Period: Mar-May	Mar-May
Elevation:	50-480 (165-1575)
General Habitats:	Valley and foothill grassland, Vernal pools
Microhabitat:
Microhabitat Details:

Conservation Status


CA Rare Plant Rank:	1B.2
Global Rank:	G2
State Rank:	S2
State List:	None
Fed List:	None
Other Status:	BLM_S; SB_UCSC; SB_USDA
CRPR Changes:

Occurrence Data from the CNDDB


Total Occurrences:	11
Element Occurrence Ranks:
Excellent (A)	4
Good (B)	3
Fair (C)	0
Poor (D)	0
None (X)	0
Unknown (U)	4

Location


California Endemic: True
California Counties and Islands: Name (Code)
Butte (BUT)
Quads: Name (Quad Code)
Oroville (3912155), Shippee (3912156)

Threat List Data from the CNDDB


Threat List Total:	6
EOs with Threat Listed:	Total EOs	% of EOs
	6	55 %
Grazing	4	36%
Other	3	27%
Recreational use (non-ORV)	3	27%
Non-native plant impacts	2	18%
ORV activity	2	18%
Foot traffic/trampling	2	18%

Notes



Possibly threatened by trampling and grazing. See T. barbigerum var. andrewsii in The Jepson Manual, and Novon 8:91 (1998) 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 21 November 2025].