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This is a small round cactus growing to a maximum height of about 15 cm (6 in), often remaining smaller and oblong or spherical. It is densely covered in a mat of star-shaped arrays of straight white spines 1 to 2.5 cm (3 ⁄ 8 to 1 in) long. It flowers in yellow, pink, red, or purple blooms 2–5 cm (3 ⁄ 4 –2 in) across.
Flowers grow 8.6–12.4 cm (3.4–4.9 in) long, and are open for less than 24 hours. Since they form only at the top of the plant and the tips of branches, saguaros growing numerous branches is reproductively advantageous. Flowers open sequentially, with plants averaging four flowers open per day over a bloom period lasting a month. [7]
In branched cacti, such as Opuntioidiae and the saguaro, new branches grow from areoles, because that is where the buds are. The development of the areole seems to have been an important element in the adaptation of cacti to niches in desert ecology. Some of the Opuntioideae have spines, as well as glochids, on their areoles; some have only ...
Cylindropuntia leptocaulis, the desert Christmas cactus, desert Christmas cholla, pencil cactus, or tasajillo, is a species of cholla cactus. Distribution and habitat
Fouquieria splendens (commonly known as ocotillo / ɒ k ə ˈ t iː j oʊ / (Latin American Spanish:), but also referred to as buggywhip, coachwhip, candlewood, slimwood, desert coral, Jacob's staff, Jacob cactus, and vine cactus) is a plant indigenous to the Mojave Desert, Sonoran Desert, Chihuahuan Desert and Colorado Desert in the Southwestern United States (southern California, southern ...
Stenocereus thurberi, the organ pipe cactus, [3] is a species of cactus native to Mexico and the United States. The species is found in rocky desert. Two subspecies are recognized based on their distribution and height. The Organ Pipe Cactus National Monument is named for the species. Cacti are minimally adapted to particular thermal niches ...
Echinocactus grusonii — golden barrel cactus, endemic to Mexico. Barrel cacti are various members of the two genera Echinocactus and Ferocactus, [1] endemic to the deserts of Southwestern North America southward to north central Mexico. [2] Some of the largest specimens are found in the Sonoran Desert.
Echinocereus reichenbachii (commonly known as lace or hedgehog cactus) is a perennial plant and shrub in the cactus family. The species is native to the Chihuahuan Desert and parts of northern Mexico and the southern United States, where they grow at elevations up to 1,500 meters (4,900 ft).