A. This plant belongs to the cactus family, and is often called the orchid cactus.

Brasiliopuntia is a genus in the cactus family, Cactaceae.

Tunilla is a South American genus of the cactus family (Cactaceae).

They are stem succulents, described as "cactiform" because of their remarkable similarity to the unrelated cactus family.

Echinocereus dasyacanthus is a member of the cactus family, Cactaceae.

Opuntioideae is a subfamily of the cactus family, Cactaceae.

However, close examination shows spines developing from areoles, and the distinctive floral cup of the cactus family.

Rat tail cactus is the common name for several members of the cactus family:

This species produces among of the largest flowers within the cactus family.

The genus Mammillaria is one of the largest in the cactus family (Cactaceae), with currently 171 known species and varieties recognized.