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The name Cactus became so confused that the 1905 Vienna botanical congress rejected Cactus as a genus name, [4] and conserved Mammillaria. [ 1 ] Mammillaria is a large and diverse genus with many species often exhibiting variations due to the nature of terrain, weather, soil and other ecological factors.
Opuntia microdasys (angel's-wings, bunny ears cactus, bunny cactus or polka-dot cactus) is a species of flowering plant in the cactus family Cactaceae, native and endemic to central and northern Mexico.
The silvery-white spines, which are actually a form of leaf, almost completely obscure the stem with a fuzzy-looking but impenetrable defense. The spines are 1 in (2.5 cm) long and covered with a detachable, paper-like sheath.
The most striking feature is the shaggy coat of long, white hairs suggestive of unkempt hair on an old man. The coat is a particularly striking silvery white on the young cactus; as the plant ages the stem begins to lose its covering. The flowers are red, yellow, or white, though the plant may not flower until 10–20 years old.
Pelecyphora, pincushion cactus or foxtail cactus [1] is a genus of cacti, comprising 20 species.They originate from Mexico and the United States. [2] [3]Common species include the Missouri foxtail cactus P. missouriensis, [4] widespread in grassland and forest west of the Mississippi, and the spinystar P. vivipara, [5] distributed across the US and into Canada, first described by Nuttall in 1813.
They are pure white and intensely reflect ultraviolet light. The hypanthium and the flower tube are scaly and covered with hair-like spines. The nectaries at the base of the flower secrete a large amount of clear nectar. The stigma lobes and the lower portion of the style are warty (papillose).
Opuntia basilaris, the beavertail cactus or beavertail pricklypear, is a cactus species found in the southwest United States. It occurs mostly in the Mojave , Anza-Borrego , and Colorado Deserts , as well as in the Colorado Plateau and northwest Mexico .
Scientific name Common Name Distribution Astrophytum asterias Lem. Sand dollar cactus, sea urchin cactus, star peyote: small parts of Texas in the United States and Mexico. Astrophytum capricorne (A.Dietr.) Britton & Rose: Goat's horn cactus: Coahuila regions of Northern Mexico. Astrophytum caput-medusae D.R.Hunt: Nuevo León, Mexico