Taxon Report

Lupinus constancei T.W. Nelson & J.P. Nelson

Lassics lupine

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Image by Amelia Ryan

Taxon Summary

Lupinus constancei, commonly known as Lassics lupine, is a perennial herb in the Fabaceae that is found only in California. It occurs within Lower montane coniferous forest, growing at elevations from 1500 to 2000 meters. Lupinus constancei is ranked 1B.1, Plants Rare, Threatened or Endangered in California and Elsewhere; Seriously threatened in California.

Classification


Scientific Name:	Lupinus constancei T.W. Nelson & J.P. Nelson
Common Name:	Lassics lupine
Family:	Fabaceae
Element Code:	PDFAB2B490
USDA Plants Symbol:	LUCO7
Synonyms/Other Names:	Lupinus humboldtii

Ecology and Life History


Lifeform:	perennial herb
Blooming Period: Jul	Jul
Elevation:	1500-2000 (4920-6560)
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:	CE
Fed List:	FE
Other Status:	SB_BerrySB; USFS_S
CRPR Changes:	changed from 1B.2 to 1B.1 on 2017-09-27

Occurrence Data from the CNDDB


Total Occurrences:	2
Element Occurrence Ranks:
Excellent (A)	0
Good (B)	0
Fair (C)	2
Poor (D)	0
None (X)	0
Unknown (U)	0

Location


California Endemic: True
California Counties and Islands: Name (Code)
Humboldt (HUM), Trinity (TRI)
Quads: Name (Quad Code)
Black Lassic (4012335)

Threat List Data from the CNDDB


Threat List Total:	3
EOs with Threat Listed:	Total EOs	% of EOs
	2	100 %
Improper burning regime	2	100%
Other	2	100%
ORV activity	1	50%

Notes




Threats:
Severely threatened by seed predation and browsing, forest encroachment, and climate change.
Taxonomy:

Selected References

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

Lupinus constancei profile for potential Species of Conservation Concern evaluation (2018)

Lupinus constancei profile for potential Species of Conservation Concern evaluation (2017)

Citation California Native Plant Society, Rare Plant Program. 2025. Rare Plant Inventory (online edition, v9.5.1). Website https://www.rareplants.cnps.org [accessed 13 November 2025].