Taxon Report

Trifolium siskiyouense J. Gillett

Siskiyou clover

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Taxon Summary

Trifolium siskiyouense, commonly known as Siskiyou clover, is a perennial herb in the Fabaceae that is found in California and elsewhere. It occurs within Meadows and seeps, growing at elevations from 880 to 1500 meters. Trifolium siskiyouense is ranked 1B.1, Plants Rare, Threatened or Endangered in California and Elsewhere; Seriously threatened in California.

Classification


Scientific Name:	Trifolium siskiyouense J. Gillett
Common Name:	Siskiyou clover
Family:	Fabaceae
Element Code:	PDFAB402S0
USDA Plants Symbol:	TRSI4
Synonyms/Other Names:

Ecology and Life History


Lifeform:	perennial herb
Blooming Period: Jun-Jul	Jun-Jul
Elevation:	880-1500 (2885-4920)
General Habitats:	Meadows and seeps
Microhabitat:	Streambanks (sometimes)
Microhabitat Details:

Conservation Status


CA Rare Plant Rank:	1B.1
Global Rank:	GH
State Rank:	SH
State List:	None
Fed List:	None
Other Status:	BLM_S
CRPR Changes:	changed from 3.2 to 1B.1 on 2014-11-21 changed from 3 to 3.2 on 2007-02-02 added to 3 on 2007-02-02

Occurrence Data from the CNDDB


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

Location


California Endemic: False
California Counties and Islands: Name (Code)
Shasta (SHA), Siskiyou (SIS)
Quads: Name (Quad Code)
City of Mount Shasta (4112233), Greenview (4112258), Hawkinsville (4112275), Montague (4112265), Montgomery Creek (4012178)

Threat List Data from the CNDDB


Threat List Total:	0
EOs with Threat Listed:	Total EOs	% of EOs
	0	%

Notes



Previously CRPR 3.2; rarity and endangerment information was needed. Move to CRPR 1A? Has not been documented since 1935 in CA and 1926 in OR; needs field surveys. Threatened by grazing (or lack thereof) and habitat conversion. Similar to T. wormskioldii. Not in TJM (1993). See Canadian Journal of Botany 58(13):1441-1442 (1980) for original description.
Threats:

Taxonomy:

Selected References

CRPR List Addition on 2007-02-02

CRPR List Change on 2014-11-21

Citation California Native Plant Society, Rare Plant Program. 2025. Rare Plant Inventory (online edition, v9.5.1). Website https://www.rareplants.cnps.org [accessed 16 November 2025].