While Gymnocalycium is of the cactus genus, what genus is the Rhynchostylis?
Gymnocalycium Gymnocalycium, commonly called chin cactus, is a genus of about 70 South American species of cactus. The genus name "Gymnocalycium" (from Greek, "naked calyx") refers to the flower buds bearing no hair or spines.
Cumulopuntia Cumulopuntia is a genus of cactus (family Cactaceae). This is a very controversial genus.