Taxon Report

Lupinus milobakeri C.P. Sm.

Milo Baker's lupine

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Taxon Summary

Lupinus milobakeri, commonly known as Milo Baker's lupine, is a annual herb in the Fabaceae that is found only in California. It occurs within Cismontane woodland (often roadsides), and Valley and foothill grassland, growing at elevations from 395 to 430 meters. Lupinus milobakeri is ranked 1B.1, Plants Rare, Threatened or Endangered in California and Elsewhere; Seriously threatened in California.

Classification


Scientific Name:	Lupinus milobakeri C.P. Sm.
Common Name:	Milo Baker's lupine
Family:	Fabaceae
Element Code:	PDFAB2B4E0
USDA Plants Symbol:
Synonyms/Other Names:	Lupinus milo-bakeri C.P. Sm.

Ecology and Life History


Lifeform:	annual herb
Blooming Period: Jun-Sep	Jun-Sep
Elevation:	395-430 (1295-1410)
General Habitats:	Cismontane woodland, Valley and foothill grassland
Microhabitat:
Microhabitat Details:

Conservation Status


CA Rare Plant Rank:	1B.1
Global Rank:	G1Q
State Rank:	S1
State List:	CE
Fed List:	None
Other Status:	SB_CalBG/RSABG; SB_UCBG
CRPR Changes:

Occurrence Data from the CNDDB


Total Occurrences:	11
Element Occurrence Ranks:
Excellent (A)	0
Good (B)	0
Fair (C)	0
Poor (D)	2
None (X)	9
Unknown (U)	0

Location


California Endemic: True
California Counties and Islands: Name (Code)
Colusa (COL), Mendocino (MEN)
Quads: Name (Quad Code)
Covelo East (3912372), Longvale (3912354), Wilbur Springs (3912214)

Threat List Data from the CNDDB


Threat List Total:	9
EOs with Threat Listed:	Total EOs	% of EOs
	9	82 %
Non-native plant impacts	7	63%
Road/trail construction/maint.	4	36%
Biocides	3	27%
Grazing	2	18%
Wood cutting or brush clearing	2	18%
Agriculture	1	9%
Foot traffic/trampling	1	9%
Vandalism/dumping/litter	1	9%
Other	1	9%

Notes



Seriously threatened by urbanization, road maintenance, road widening, and herbicide application. Potentially threatened by competition. See L. luteolus in TJM (1993). See Four Seasons 1(3):8-9 (1965) and TJM2 for differentiation from L. luteolus.
Threats:

Taxonomy:

Selected References

Citation California Native Plant Society, Rare Plant Program. 2025. Rare Plant Inventory (online edition, v9.5.1). Website https://www.rareplants.cnps.org [accessed 15 November 2025].