Northern Prairie Wildlife Research Center
Western Wetland Flora
Field Office Guide to Plant Species
Astragalus agrestis Dougl. ex G. Don
- Family: Pea (Leguminosae)
- Flowering: May-August
- Field Marks: Of all the species of Astragalus, this species differs by its united stipules and its large flowers that are 3/4-1 inch long and crowded into ovoid heads.
- Habitat: Pastures, hillsides, prairies, along roads.
- Habit: Perennial herb with a taproot.
- Stems: Upright, up to 15 inches tall, gray-hairy.
- Leaves: Alternate, pinnately compound with 9-25 leaflets, each leaflet oblong to oblong ovate, up to 1 1/2 inches long, up to 1/3 inch wide, pointed or rounded at the tip, tapering or rounded at the base, with appressed hairs; stipules united, u
- Flowers: Up to 50 crowded into ovoid heads arising from the leaf axils, the heads up to 6 inches long; flower stalks about 1/20 inch long.
- Sepals: 5, united below into a tube, up to 1/2 inch long, with black and white hairs.
- Petals: 5, arranged in the form of a sweet pea flower, purple to pink to blue to even
whitish, up to 1 inch long.
- Stamens: 10.
- Pistils: Ovary superior, minutely hairy.
- Fruits: Pods up to 1/2 inch long, up to 1/6 inch wide, with appressed hairs, sessile; seeds smooth, brown, up to 1/8 inch long.
- Notes: The hairiness of this species is extremely variable, as is the flower color.
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