Cacti are unit succulent perennial plants. Cacti typically have thick nonwoody or woody chlorophyll-containing stems. Cacti is distinguished from different succulent plants by the presence of areoles, little cushionlike structures with trichomes (plant hairs) and, in most species, spines or barbed bristles (glochids). Areoles area unit changed branches, from that flowers, additional branches, and leaves (when present) might grow.