Species Details

Astragalus tener var. tener

alkali milk-vetch

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Scientific Name:
Astragalus tener Gray var. tener
Common Name:
alkali milk-vetch
Family: Fabaceae
Element Code: PDFAB0F8R1
USDA Plants Symbol: ASTET2
Synonyms/Other Names:
Lifeform: annual herb
Blooming Period: Mar-Jun
1 - 60 meters
5 - 195 feet
General Habitat:
  • Playas
  • Valley and foothill grassland (adobe clay)
  • Vernal pools
General Micro Habitat:
Micro Habitat:
  • Alkaline
Threatened by development, competition from non-native plants, and habitat destruction, especially agricultural conversion. Possibly threatened by trampling. Potentially threatened by energy transmission line construction. See Proceedings of the American Academy of Arts and Sciences 6:206 (1864) for original description, and Systematic Botany 17(3):367-379 (1992) for distributional information.
Total Occurrences: 65
Element Occurrence Ranks:
1 27 1 2 28 6
Occurrence Status:
Historical >20 Years 51
Recent <=20 Years 14
Presumed Extant 37
Possibly Extirpated 18
Presumed Extirpated 10
California Endemic:
California Island:
States: Name (Code)
California (CA)
California Counties and Islands: Name (Code)
Alameda (ALA), Contra Costa (CCA)*, Merced (MER), Monterey (MNT)*, Napa (NAP), San Benito (SBT)*, San Francisco (SFO)*, San Joaquin (SJQ)*, Santa Clara (SCL)*, Solano (SOL), Sonoma (SON)*, Stanislaus (STA)*, Yolo (YOL)
Quads: Name (Quad Code)
Altamont (3712166), Antioch North (3812117), Arena (3712036), Byron Hot Springs (3712176)*, Clifton Court Forebay (3712175)*, Crows Landing (3712141)*, Cuttings Wharf (3812223), Davis (3812156)*, Denverton (3812128), Dixon (3812147)*, Dozier (3812137), Elmira (3812138), Fairfield North (3812231)*, Fairfield South (3812221), Grays Bend (3812166), Gustine (3712038), Hayward (3712261)*, Hollister (3612174)*, Honker Bay (3812118), Livermore (3712167), Milpitas (3712148), Mountain View (3712241)*, Napa (3812233)*, Natividad (3612165), Newark (3712251)*, Oakland East (3712272)*, Oakland West (3712273)*, Petaluma (3812226)*, Petaluma River (3812225), Richmond (3712283)*, Salinas (3612166)*, San Francisco North (3712274)*, San Francisco South (3712264), San Leandro (3712262)*, San Luis Ranch (3712027), Saxon (3812146), Stevinson (3712037), Stockton West (3712183)*, Woodward Island (3712185)
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