仙人掌属目前分类只包括约200种 圆柱状仙人掌被单独分为一个圆柱仙人掌属（Cylindropuntiais），其他圆筒状仙人掌如以前分在Austrocylindropuntia属、Corynopuntia属和Micropuntia中的种类都包括在本属中。

仙人掌属植物一般具有扁平的绿色叶状茎，来完成光合作用，叶退化成刺，有两种，一种大刺和另一种小刺毛，果实为浆果，可以食用，作为水果，许多品种的叶状茎也可以作为蔬菜食用。仙人掌属植物多数生长在美洲，只有少数品种生长在其他热带地区。

Opuntia is a genus in the cactus family, Cactaceae.

The most common culinary species is the Indian fig opuntia (O. ficus-indica). Most culinary uses of the term "prickly pear" refer to this species. Prickly pears are also known as tuna (fruit), sabra, nopal (paddle, plural nopales) from the Nahuatl word nōpalli for the pads, or nostle, from the Nahuatl word nōchtli for the fruit; or paddle cactus.