Psorothamnus scoparius (A. Gray) Rydb. Psorothamnus scoparius (A. Gray) Rydb., N. Amer. Fl. 24(1): 48. 1919 sec. Ulloa Ulloa & al. 2018≡Dalea scoparia A. Gray in Mem. Amer. Acad. Arts, n.s., 4(1): 32. 1849 syn. sec. Tropicos 2013