Acmispon argyraeus, synonym Lotus argyraeus, is a species of legume native to California and northwest Mexico.

[1] It is known by the common name canyon bird's-foot trefoil.

It is a perennial herb lined with leaves each made up of a few oval leaflike leaflets about 1 cm long.

The inflorescence holds one to three pinkish-yellow flowers roughly 1 cm long.

The fruit is a dehiscent legume pod up to 2.5 cm long.