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Genus Gymnocalycium
- large genus of low-growing globular South American cacti with spiny ribs covered with many tubercles
Genus Harrisia
- genus of slender often treelike spiny cacti with solitary showy nocturnal white or pink flowers; Florida and Caribbean to South America
Genus Hatiora
- small genus of South American epiphytic or lithophytic cacti
Genus Hylocereus
- genus of climbing or epiphytic tropical American cacti with angular stems and mostly white very fragrant flowers
Genus Lemaireocereus
- tropical American cacti usually tall and branching with stout spines and funnel-shaped flowers and globular or ovoid often edible fruit
Genus Lophophora
- two species of small cacti of northeastern Mexico and southwestern United States having rounded stems covered with jointed tubercles: mescal
Genus Mammillaria
- large genus of cacti characterized chiefly by nipple-shaped protuberances or tubercles on their surface
Genus Melocactus
- genus of strongly ribbed globose or spheroid cacti of tropical South and Central America and the Caribbean
Genus Myrtillocactus
- small genus of arborescent cacti of Mexico and Central America
Genus Pediocactus
- low-growing cacti of the Great Plains of North America