Cactus nigricans Kuntze [ Mammillaria nigricans Fennel in Otto & A. Dietr.]
no HD illustration available (m1)
Cactus nigricans Kuntze [Cactaceae]
L.K.G. Pfeiffer, F. Otto, Abbild. Beschr. Cact. (Coloured version), vol. 2 : p. 23, t. 23 (1839)