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
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Elevation:
1 - 60 meters
5 - 195 feet
General Habitats:
  • Playas
  • Valley and foothill grassland (adobe clay)
  • Vernal pools
Microhabitat Details:
Microhabitat:
  • Alkaline
Notes:
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.
Threats:
Taxonomy:
Threat List Total: 12
Total EOs % of EOs
EOs with Threat Listed: 35 54 %
THREAT LIST:
Grazing 17 26%
Development 12 18%
Non-native plant impacts 7 10%
Agriculture 6 9%
Biocides 2 3%
Total Occurrences: 65
Element Occurrence Ranks:
A B C D X U
1 27 1 2 28 6
Occurrence Status:
Historical >20 Years 55
Recent <=20 Years 10
Presence:
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), 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)
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.
Presumed Extant
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