Abstract:Thermopsis lanceolata R. Br. has been taken as the type of Thermopsis for a long time. According to the Internatioal Code of Botanical Nomenclature, T. lanceolata is an illegimate name, and the type of the genus should be T. lupinoides (L.) Link. The species with alternate flowered inflorescence distributed in northeastern Asia which has incorrectly been identified as T. lupinoides (L.) Link before, should be determined as T. fabacea (Pall.) DC..