Neolloydia conoidea (DC.) Britton & Rose [ Mammillaria conoidea DC.]
Neolloydia conoidea (DC.) Britton & Rose [ Mammillaria conoidea DC.] [Cactaceae]
L.K.G. Pfeiffer, F. Otto, Abbild. Beschr. Cact. (Coloured version), vol. 2 : p. 26, t. 26 (1839)