Astragalus americanus (Hook.) M.E. Jones
American milk-vetch, American milkvetch, Rattlepod
Fabaceae (Pea Family)
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.
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Plant CharacteristicsDuration: Perennial
Leaf Arrangement: Alternate
Leaf Complexity: Pinnate
Breeding System: Flowers Bisexual
Fruit Type: Legume
Size Class: 1-3 ft.
Bloom InformationBloom Color: White , Green
Bloom Time: Jun , Jul , Aug
DistributionUSA: AK , CO , MT , SD , WY
Canada: AB , BC , 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.
Value to Beneficial InsectsSpecial Value to Native Bees
Special Value to Bumble Bees
This information was provided by the Pollinator Program at The Xerces Society for Invertebrate Conservation.
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
Recommended Species Lists
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Additional resourcesUSDA: Find Astragalus americanus in USDA Plants
FNA: Find Astragalus americanus in the Flora of North America (if available)
Google: Search Google for Astragalus americanus
MetadataRecord Modified: 2007-01-01
Research By: TWC Staff