cactus-blooming flower

They are unusual and distinctive , which are adapted to extremely and/or hot , as well as tropical environments as or hemi-epiphytes.

Cactuses are perennial and grow as trees, shrubs, or vines. Most cactus's have spiky spines so predators don't hurt them.

The flowers, mostly radially symmetrical and bisexual, bloom either by day or by night, depending on the species. Their shape varies from tube-like through bell-like to wheel-shaped, and their size from 0.2 to 1530 centimeters. Most of them have numerous (from 5 to 50 or more), and change form from outside to inside.

 Cacti, cultivated by people worldwide, are a familiar sight as potted plants, houseplants or in ornamental gardens in warmer climates.