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Astragalus americanus (Hook.) M.E. Jones
American milk-vetch, American milkvetch, Rattlepod
Synonym(s): Astragalus frigidus var. americanus, Astragalus frigidus var. gaspensis, Phaca americana
USDA Symbol: ASAM3
A woody-based, branched perennial,1-3 ft. tall with large, light green, pinnately-compound leaves and greenish-white, tinged purple, pea-like flowers in loose racemes.
Bloom InformationBloom Color: White , Green
Bloom Time: Jun , Jul , Aug
, WY Canada: AB
, SK Native Distribution: AK,
s. in Rockies though e. B.C. & MT
to CO; also in the Black Hills & scattered e. in Canada to Que. Native Habitat:
Stream banks; meadows; thicket openings; flood plains
Growing ConditionsLight Requirement: Part Shade
Soil Moisture: Moist
Soil Description: Moist, rocky or sandy soils.
PropagationDescription: Easily propagated by seed sown unstratified in fall or stratified in spring.
Seed Collection: Take care to collect pods before seeds are eaten by insects.
Seed Treatment: Scarification, inoculation, and moist stratification for 10 days.
Commercially Avail: yes
National Wetland Indicator Status
This information is derived from the U.S. Army Corps of Engineers National Wetland Plant List, Version 3.1
(Lichvar, R.W. 2013. The National Wetland Plant List: 2013 wetland ratings. Phytoneuron 2013-49: 1-241). Click here
for map of regions.
Record Last Modified: 2007-01-01
Research By: TWC Staff