Species Details

Astragalus hornii var. hornii

Horn's milk-vetch

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Scientific Name:
Astragalus hornii A. Gray var. hornii
Common Name:
Horn's milk-vetch
Family: Fabaceae
Element Code: PDFAB0F421
USDA Plants Symbol:
Synonyms/Other Names:
CA Rare Plant Rank: 1B.1
Fed List: None
State List: None
Global Rank: GUT1
State Rank:
Other Status: BLM_S
CRPR Changes:
added to 1B.1 on 2006-11-28
added to 1B.1 on 2006-11-27
Add Date: 2006-12-01
Date Edited: 2021-08-25
Lifeform: annual herb
Blooming Period: May-Oct
60 - 850 meters
195 - 2790 feet
General Habitat:
  • Meadows and seeps
  • Playas
General Micro Habitat:
Micro Habitat:
  • Alkaline
  • Lake Margins
Subject to eradication efforts in early 1900's because it was poisonous to sheep. Threatened by habitat alteration. See Proceedings of the California Academy of Arts 7: 398 (1868) for original description.
Total Occurrences: 28
Element Occurrence Ranks:
0 3 2 0 5 18
Occurrence Status:
Historical >20 Years 22
Recent <=20 Years 6
Presumed Extant 23
Possibly Extirpated 0
Presumed Extirpated 5
California Endemic:
California Island:
States: Name (Code)
California (CA), Nevada (NV)
California Counties and Islands: Name (Code)
Inyo (INY), Kern (KRN), Kings (KNG), Los Angeles (LAX), Orange (ORA), Riverside (RIV), San Bernardino (SBD)*
Quads: Name (Quad Code)
Anaheim (3311778), Arvin (3511827), Beaumont (3311688), Buttonwillow (3511944), Cathedral City (3311674), Conner (3511921), Fellows (3511925), Frazier Mtn. (3411878), Gosford (3511931), Grapevine (3411888), Lamont (3511838), Little Buttes (3411873), Lokern (3511945), Lone Pine (3611851), Lone Tree Well (3511976), Long Beach (3311872), Los Alamitos (3311871), Lost Hills NE (3511965), Newport Beach (3311768), Oildale (3511941), Palm Springs (3311675), Palm View Peak (3311665), Palmdale (3411851), Rancho Mirage (3311664), Ritter Ridge (3411852), San Bernardino South (3411713), Seal Beach (3311861), Semitropic (3511955), Stevens (3511932), Tupman (3511933), Union Wash (3611861), Wasco SW (3511954), Weed Patch (3511828), Willow Springs (3411883)
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.


Presumed Extant
Counties   Quads