Not an accepted name (status: unknown). The accepted name is Hedysarum alpinum subsp. alpinum 1753.

Hedysarum alpinum var. americanum Michx. ex Pursh, 1813 17% complete

No common name

Fl. Amer. Sept. 2: 484 (1813)

There is no corrections for Hedysarum alpinum var. americanum yet.