Taxon Report

Trifolium howellii Wats.

Howell's clover

Print Report

Taxon Summary

Trifolium howellii, commonly known as Howell's clover, is a perennial herb in the Fabaceae that is found in California and elsewhere. It occurs within Lower montane coniferous forest, Meadows and seeps, and Upper montane coniferous forest, growing at elevations from 800 to 1800 meters. Trifolium howellii is ranked 4.3, Plants of Limited Distribution, A Watch List; Not very threatened in California.

Classification


Scientific Name:	Trifolium howellii Wats.
Common Name:	Howell's clover
Family:	Fabaceae
Element Code:	PDFAB40140
USDA Plants Symbol:	TRHO
Synonyms/Other Names:

Ecology and Life History


Lifeform:	perennial herb
Blooming Period: Jun-Aug	Jun-Aug
Elevation:	800-1800 (2625-5905)
General Habitats:	Lower montane coniferous forest, Meadows and seeps, Upper montane coniferous forest
Microhabitat:	Mesic
Microhabitat Details:

Conservation Status


CA Rare Plant Rank:	4.3
Global Rank:	G4
State Rank:	S4
State List:	None
Fed List:	None
Other Status:
CRPR Changes:

Occurrence Data from the CNDDB


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

Location


California Endemic: False
California Counties and Islands: Name (Code)
Del Norte (DNT), Humboldt (HUM), Siskiyou (SIS)
Quads: Name (Quad Code)
Takilma (4212315), Grouse Mtn. (4012376), Marble Mountain (4112352), Ukonom Mtn. (4112354)

Threat List Data from the CNDDB


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

Notes




Threats:

Taxonomy:

Selected References

Trifolium howellii profile for potential Species of Conservation Concern evaluation (2018)

Citation California Native Plant Society, Rare Plant Program. 2025. Rare Plant Inventory (online edition, v9.5.1). Website https://www.rareplants.cnps.org [accessed 19 November 2025].