Taxon Details

Acmispon haydonii

pygmy lotus

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Taxon Summary:

Acmispon haydonii, commonly known as pygmy lotus, is a perennial herb in the Fabaceae that is found in California and elsewhere. It occurs within Pinyon and juniper woodland, and Sonoran desert scrub, growing at elevations from 520 to 1200 meters. Acmispon haydonii is ranked 1B.3, Plants Rare, Threatened or Endangered in California and Elsewhere; Not very threatened in 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
Name Status:	JEF, FNA, POWO, IPNI, Tropicos

Conservation Status

CA Rare Plant Rank:	1B.3
Fed List:	None
State List:	None
Global Rank:	G3
State Rank:	S3
Other Status:	BLM_S; SB_CRES; SB_USDA
CRPR Changes:
Add Date:	1994-01-01
Date Edited:	2024-11-05

Ecology and Life History

Lifeform: perennial herb

Blooming Period: Jan-Jun

Elevation:
520 - 1200 meters
1705 - 3935 feet

General Habitats:

Pinyon and juniper woodland
Sonoran desert scrub

Microhabitat Details:

Microhabitat:

Rocky

Notes

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:

Threat List Data from the CNDDB

THREAT LIST:
Threat List Total:	9
	Total EOs	% of EOs
EOs with Threat Listed:	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%

Occurrence Data from the CNDDB

Element Occurrence Ranks:
Total Occurrences:					32
A	B	C	D	X	U
0	5	2	0	0	25

Occurrence Status:
Historical >20 Years	9
Recent <=20 Years	23

Presence:
Presumed Extant	32
Possibly Extirpated	0
Presumed Extirpated	0

Location

California Endemic:

California Island:

States: Name (Code)
Baja California (BA), California (CA)

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)

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

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CNPS Rare Plant Inventory