Taxon Details

Lathyrus biflorus

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:
Name Status:	JEF, FNA, POWO, IPNI, Tropicos

Conservation Status

CA Rare Plant Rank:	1B.1
Fed List:	None
State List:	None
Global Rank:	G1
State Rank:	S1
Other Status:	USFS_S
CRPR Changes:
Add Date:	1984-01-01
Date Edited:	2025-06-03

Ecology and Life History

Lifeform: perennial herb

Blooming Period: Jun-Aug

Elevation:
1370 - 1385 meters
4495 - 4545 feet

General Habitats:

Lower montane coniferous forest (serpentinite)

Microhabitat Details:

Microhabitat:

Notes

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

Threat List Data from the CNDDB

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

Occurrence Data from the CNDDB

Element Occurrence Ranks:
Total Occurrences:					1
A	B	C	D	X	U
0	1	0	0	0	0

Occurrence Status:
Historical >20 Years	1
Recent <=20 Years	0

Presence:
Presumed Extant	1
Possibly Extirpated	0
Presumed Extirpated	0

Location

California Endemic:

California Island:

States: Name (Code)
California (CA)

California Counties and Islands: Name (Code)
Humboldt (HUM)

Quads: Name (Quad Code)
Dinsmore (4012345)

Notes:

Definitions of codes following a county and/or quad:
*		Presumed extirpated
(?)		Occurrence confirmed, but possibly extirpated
Quad and county data is imported from the CNDDB. Species may be present in other areas where conditions are favorable. These data should NOT be substituted for pre-project review or for on-site surveys.

Regional Map

Map

Presumed Extant

Click on quad for name. Hold Shift Key to use mouse scroll wheel

Original Description:	Brittonia 35(2):180-183 (1983)
Species Account:	Lathyrus biflorus profile for potential Species of Conservation Concern evaluation (2018)

CNPS Rare Plant Inventory