Melocactus violaceus Pfeiff.
no HD illustration available (m1)
Melocactus violaceus Pfeiff. [Cactaceae]
C.F.P. von Martius, A.G. Eichler, I. Urban, Fl. Bras., vol. 4(2): fasicle 108, (Balanophoreae; Aristolochiaceae; Rafflesiaceae; Nymphaeaceae; Cactaceae): t. 48 (1890)