macro image of a cactus in red rock state park in arizona, united states.

blossom flower yellow nature purple plant petal leaf pink food cacti adaptations conserve succulents thickened fleshy species leaves retaining spines modified herbivores cactus shade absence cacti's stems photosynthesis native americas dry dries stem succulent photosynthesis flower leaf nopal shrub plant succulent carnegiea gigantea nopal shrub opuntia mammillaria thorns spines prickles transpiration africa caryophyllales night-blooming cereus peyote patagonia chlorophyll epiphyte saguaro stoma pereskia mesquite xerophyte schlumbergera desert cactaceae cochineal maihuenia areole ariocarpus pereskiopsis hibiscus agave pachycereus pringlei barrel houseplant flowers theophrastus prickly