Agave neocernua Thiede Agave neocernua Thiede in Bradleya 33: 83. 2015 sec. Thiede 2015=Polianthes cernua Art. Castro, J.G. González & Aarón Rodr. in Phytotaxa 201(2): 143. 2015 syn. sec. Thiede 2015