Aristida purpurea f. brownii (Warnock) Allred & Valdés-Reyna Aristida purpurea f. brownii (Warnock) Allred & Valdés-Reyna in Novon 5(3): 221. 1995 sec. Dávila & al. 2018=Aristida brownii Warnock in Sida 9(4): 358, f. 1. 1982 syn. sec. Dávila & al. 2006