Taxon Report

Lathyrus biflorus T.W. Nelson & J.P. Nelson

two-flowered pea

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Taxon Summary

Lathyrus biflorus, commonly known as two-flowered pea, is a perennial herb in the Fabaceae that is found only in California. It occurs within Lower montane coniferous forest, growing at elevations from 1370 to 1385 meters. Lathyrus biflorus is ranked 1B.1, Plants Rare, Threatened or Endangered in California and Elsewhere; Seriously threatened in California.

Classification


Scientific Name:	Lathyrus biflorus T.W. Nelson & J.P. Nelson
Common Name:	two-flowered pea
Family:	Fabaceae
Element Code:	PDFAB25180
USDA Plants Symbol:	LABI3
Synonyms/Other Names:

Ecology and Life History


Lifeform:	perennial herb
Blooming Period: Jun-Aug	Jun-Aug
Elevation:	1370-1385 (4495-4545)
General Habitats:	Lower montane coniferous forest
Microhabitat:
Microhabitat Details:

Conservation Status


CA Rare Plant Rank:	1B.1
Global Rank:	G1
State Rank:	S1
State List:	None
Fed List:	None
Other Status:	USFS_S
CRPR Changes:

Occurrence Data from the CNDDB


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

Location


California Endemic: True
California Counties and Islands: Name (Code)
Humboldt (HUM)
Quads: Name (Quad Code)
Dinsmore (4012345)

Threat List Data from the CNDDB


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

Notes



Known from only one occurrence on Red Mtn. in the Lassics area.
Threats:
Threatened by logging and grazing.
Taxonomy:

Selected References

Brittonia 35(2):180-183 (1983)

Lathyrus biflorus 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 31 October 2025].