Lotus argophyllus is a species of legume known by the common name silver bird's-foot trefoil or silver lotus. It is also sometimes classified as Acmispon argophyllus. It is endemic to 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.