Key to Tribes

Leaves broad, flat; glochids wanting; flowers stalked (sometimes short-stalked), often clustered 1. Pereskieae

Leaves (except in Pereskiopsis) terete or subterete, usually small, often wanting on the vegetative parts; flowers sessile

Areoles with glochids (except in Maihuenia); vegetative parts bearing leaves, which are usually small and fugacious; flowers rotate (petals erect in Nopalea) 2. Opuntieae

Areoles without glochids; usually no leaves on the vegetative parts (except cotyledonary); flowers with definite tubes (except Rhipsalis) 3. Cereeae

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