Astragalus scaphoides

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Bitterroot milkvetch
Astragalus scaphoides.JPG
Astragalus scaphoides
Scientific classification
Kingdom: Plantae
(unranked): Angiosperms
(unranked): Eudicots
(unranked): Rosids
Order: Fabales
Family: Fabaceae
Genus: Astragalus
Species: A. scaphoides
Binomial name
Astragalus scaphoides

Astragalus scaphoides (Bitterroot milkvetch), is a flowering plant in the family Fabaceae, found only in a small area of southwest Montana and adjacent parts of Idaho. It grows on shallow, south-facing slopes, in semi-arid sage scrub.

Astragalus scaphoides is a perennial herbaceous plant, with pinnate leaves. The pale yellow flowers open in May and are visited by several species of bumblebees and solitary bees, including species from the genera Osmia and Anthophora.

Plants can be found near Lemhi Pass on the Montana-Idaho border, and near Bannack State Park in Montana.

Plants tend to flower in alternate years,[1] similarly to mast years in grasses and trees.


  1. ^ Gurevitch, J., S. M. Scheiner, and G. A. Fox. The Ecology of Plants, Second Edition. Sinauer Associates, Inc., Sunderland MA USA

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