cacti Definition

any of a family (Cactaceae, the cactus family) of plants that have succulent stems and branches with scales or spines instead of leaves and are found especially in dry areas (such as deserts)

any of a genus (Ferocactus) of nearly globular deeply ribbed spiny cacti of Mexico and the adjacent U.S.; also : any of several similar cacti (genus Echinocactus)

a branching Brazilian cactus (Schlumbergera bridgesii synonym S. buckleyi) having flat jointed stems with scalloped margins and showy usually red, pink, white, violet, or yellow flowers; also : a related cactus (Schlumbergera truncata synonym Zygocactus truncatus) or a hybrid of this and the Christmas cactus

saguaro

night-blooming cereus; also : the usually large, white flower of a night-blooming cereus

a commonly cultivated tropical American cactus (Aporocactus flagelliformis) with showy crimson flowers