Astragalus laxmannii var. robustior

(Prairie Milkvetch)

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Astragalus laxmannii var. robustior. Pawnee Buttes, Weld Co. 7487

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Astragalus laxmannii var. robustior. Pawnee Buttes, Weld Co. 7482

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Astragalus laxmannii var. robustior. Pawnee Buttes, Weld Co. 7484

Scientific Name Astragalus laxmannii var. robustior USDA PLANTS Symbol ASLAR
Common Name Prairie Milkvetch ITIS Taxonomic Serial No. 566195
Family Fabaceae (Pea) SEINet
Reference
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Description Life zones and habitat: Plains to subalpine (4000 to 10500 ft.); sandy soils and rock outcrops in prairies, open forests and mountain meadows.
Plant: Erect, tufted or decumbent perennial with numerous stems 4 to 12 inches tall.
Leaves: Alternate, , pinnately-compound leaves 1-1/2 to 6 inches long, each with 11 to 21 narrowly elliptic-lanceolate to oblong leaflets 3/8 to 1 inch long; upper surface smooth or covered with appressed hairs, lower surface hairy.
Inflorescence: Dense, head-like or spike-like raceme arising on stalks 2 to 6 inches long from leaf axils; head with 15 to 50 short-stalked, ascending, pea-like flowers with blue-lavender to white corollas, 1/2 to almost 3/4-inch long; calyces have appressed black and white hairs, and sharply-pointed teeth from 1/3 as long to as long as the calyx tubes.
Bloom Period: June to August.
References: "Flora of Colorado" by Jennifer Ackerfield and E-Flora-BC.
BONAP Distribution Map
Colorado Status:
Native

© Tom Lebsack 2022

Banner photo: Ten Mile Range and Rhodiola integrifolia (King’s Crown) in Summit County