Taxon Details

Astragalus preussii var. laxiflorus

Lancaster milk-vetch

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Taxon Summary:

Astragalus preussii var. laxiflorus, commonly known as Lancaster milk-vetch, is a perennial herb in the Fabaceae that is found in California and elsewhere. It occurs within Chenopod scrub, growing at elevations from 700 to 700 meters. Astragalus preussii var. laxiflorus is ranked 1B.1, Plants Rare, Threatened or Endangered in California and Elsewhere; Seriously threatened in California.

Classification

Scientific Name: Astragalus preussii Gray var. laxiflorus Gray
Common Name: Lancaster milk-vetch
Family:	Fabaceae
Element Code:	PDFAB0F721
USDA Plants Symbol:	ASPRL2
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:	G4T2
State Rank:	S1
Other Status:
CRPR Changes:
Add Date:	1988-01-01
Date Edited:	2021-05-26

Ecology and Life History

Lifeform: perennial herb

Blooming Period: Mar-May

Elevation:
700 - 700 meters
2295 - 2295 feet

General Habitats:

Chenopod scrub

Microhabitat Details:

Microhabitat:

Notes

Notes: Known in CA only from near Lancaster and Edwards AFB, where extremely rare; only reported once in recent years. Field work needed. See Proceedings of the American Academy of Arts and Sciences 13:369 (1878) for original description, and Memoirs of the New York Botanical Garden 13:576 (1964) for taxonomic treatment.
Threats:
Taxonomy:

Threat List Data from the CNDDB

THREAT LIST:
Threat List Total:	1
	Total EOs	% of EOs
EOs with Threat Listed:	1	20 %
Development	1	20%

Occurrence Data from the CNDDB

Element Occurrence Ranks:
Total Occurrences:					5
A	B	C	D	X	U
0	0	0	0	2	3

Occurrence Status:
Historical >20 Years	5
Recent <=20 Years	0

Presence:
Presumed Extant	3
Possibly Extirpated	2
Presumed Extirpated	0

Location

California Endemic:

California Island:

States: Name (Code)
Arizona (AZ), California (CA), Nevada (NV)

California Counties and Islands: Name (Code)
Kern (KRN), Los Angeles (LAX), Riverside (RIV)

Quads: Name (Quad Code)
Indio (3311662), La Quinta (3311663), Lancaster East (3411861), Lancaster West (3411862)?*, Martinez Mtn. (3311653), Redman (3411778)

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