Asclepias asperula (Decne.) Woodson Asclepias asperula (Decne.) Woodson in Ann. Missouri Bot. Gard. 41(1): 193. 1954 sec. Juárez-Jaimes & al. 2007≡Acerates asperula Decne., Prodr. 8: 522. 1844 syn. sec. Woodson Jr. 1954