Acmispon argophyllus, synonym Lotus argophyllus, is a species of legume native to California and northwest Mexico. It is known by the common name silver bird's-foot trefoil or silver lotus. It is native to northwest Mexico and California, where it can be found in the southern California Coast Ranges, Peninsular Ranges, and Transverse Ranges, the Sierra Nevada, Southern California coastal zones, and the Channel Islands. It is found on sheltered rocky slopes in chaparral, conifer forest, and other habitat types.