Streptanthus platycarpus A. Gray Streptanthus platycarpus A. Gray in Smithsonian Contr. Knowl. 5(6): 10-11. 1853 sec. Rollins 1993=Erysimum platycarpum (A. Gray) Kuntze, Revis. Gen. Pl. 2: 933. 1891 syn. sec. Rollins 1993