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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
Genus Nopalea
- a genus of the cactus family with scarlet flowers
Genus Opuntia
- large genus of cactuses native to America: prickly pears
Genus Pereskia
- genus of tropical American shrubby trees and woody climbers having slender branches with broad flat leaves and large panicles of flowers
Genus Peireskia
- genus of tropical American shrubby trees and woody climbers having slender branches with broad flat leaves and large panicles of flowers
Genus Rhipsalis
- large genus of epiphytic or lithophytic unarmed cacti with usually segmented stems and pendulous branches; flowers are small followed by berrylike fruits