Taxon Report

Acmispon haydonii (Orcutt) Brouillet

pygmy lotus

Print Report

© 1995 Saint Mary's College of California

Classification


Scientific Name:	Acmispon haydonii (Orcutt) Brouillet
Common Name:	pygmy lotus
Family:	Fabaceae
Element Code:	PDFAB2A0H0
USDA Plants Symbol:
Synonyms/Other Names:	Lotus haydonii

Ecology and Life History


Lifeform:	perennial herb
Blooming Period: Jan-Jun	Jan-Jun
Elevation:	520-1200 (1705-3935)
General Habitats:	Pinyon and juniper woodland, Sonoran desert scrub
Microhabitat:	Rocky
Microhabitat Details:

Conservation Status


CA Rare Plant Rank:	1B.3
Global Rank:	G3
State Rank:	S3
State List:	None
Fed List:	None
Other Status:	BLM_S; SB_CRES; SB_USDA
CRPR Changes:

Occurrence Data from the CNDDB


Total Occurrences:	32
Element Occurrence Ranks:
Excellent (A)	0
Good (B)	5
Fair (C)	2
Poor (D)	0
None (X)	0
Unknown (U)	25

Location


California Endemic: False
California Counties and Islands: Name (Code)
Imperial (IMP), Riverside (RIV), San Diego (SDG)
Quads: Name (Quad Code)
Agua Caliente Springs (3211683), Borrego Palm Canyon (3311634), Coyote Wells (3211568), Earthquake Valley (3311614), In-ko-pah Gorge (3211661), Jacumba (3211662), Monument Peak (3211684), Palm Springs (3311675), Sombrero Peak (3211673), Sweeney Pass (3211672), Toro Peak (3311654), Tubb Canyon (3311624), Whale Peak (3311613)

Threat List Data from the CNDDB


Threat List Total:	9
EOs with Threat Listed:	Total EOs	% of EOs
	11	34 %
ORV activity	7	21%
Foot traffic/trampling	6	18%
Vandalism/dumping/litter	3	9%
Development	2	6%
Other	2	6%
Recreational use (non-ORV)	1	3%
Road/trail construction/maint.	1	3%
Mining	1	3%
Non-native plant impacts	1	3%

Notes



Possibly threatened by vehicles and non-native plants. See West American Scientist 6:63 (1889) for original description, Pittonia 2:149 (1890) for revised nomenclature, and Memoirs of the New York Botanical Garden 25:128-206 (1981) for taxonomic treatment.
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 7 January 2025].