Encyclopedia

Complete guide to the genus Thelocactus. The jewel cacti of the Chihuahuan Desert: 13 species, bicoloured spines, and vivid magenta-to-white flowers on calcicole limestone plants from Texas to Oaxaca.

Cochemiea poselgeri care and identification. Type species of Cochemiea; sprawling Baja California Sur shrub with hooked spines and zygomorphic scarlet hummingbird-pollinated flowers; IUCN Least Concern, CITES Appendix II.

Stenocactus crispatus is a central Mexican brain cactus with 30 to 60 thin wavy ribs, a dark matte olive-green body, and the largest known synonym pool in the genus. One of the first cacti to bloom in spring. CITES Appendix II, IUCN Data Deficient.

Stenocactus phyllacanthus is the grass-blade Stenocactus: 25 to 60 strongly wavy ribs and 1 to 3 flat, elongated central spines that mimic dried grass in its high-plateau Mexican habitat. Yellowish-white flowers with a brownish-red throat. IUCN Data Deficient, CITES Appendix II.

Stenocactus vaupelianus is the densely bristly-spined Stenocactus of Hidalgo and San Luis Potosi: 15 to 25 cream-white radial spines per areole give the plant a soft golden-glowing appearance unlike any other genus member. Pale yellow to creamy-white flowers. CITES Appendix II, IUCN Data Deficient.

Complete guide to the genus Stenocactus, the brain cacti of central Mexico. Nine accepted species defined by extreme wavy-rib counts, with five Tier-A species covered here in depth.

Thelocactus bicolor is the Glory of Texas cactus, a bicoloured-spine Chihuahuan Desert calcicole with vivid magenta flowers and an RHS Award of Garden Merit; ranges from south Texas through seven Mexican states. Cactaceae.

Thelocactus hexaedrophorus is the type species of its genus, a flat blue-grey Chihuahuan Desert calcicole with near-hexagonal tubercles, a prominent taproot, and delicate white to pale pink flowers; the RHS Award of Garden Merit holder in Thelocactus. Cactaceae, Mexico.

Acharagma aguirreanum is a Critically Endangered miniature cactus from the Sierra de la Paila, Coahuila, Mexico; fewer than 1,000 individuals survive in a range of under 1 km2. Solitary dark-spined habit; pale cream to yellowish flowers. Cactaceae.

Acharagma galeanense is a single-locality limestone-calcicole cactus from Galeana, Nuevo Leon, Mexico; elevated to species rank by Lode 2017; cylindrical prostrate stems and cream-yellow flowers distinguish it from its sister taxon A. roseanum. Cactaceae.