Cactoideae

Ariocarpus retusus is a slow, stone-like cactus that does not behave like the common mental image of a cactus. It has no dramatic spine display; instead it forms a low rosette of thick triangular tubercles that make the plant look almost geological. On the product page it can be presented with the buyer-friendly name “Living Rock Cactus.” In the botanical dictionary, the display name remains Ariocarpus retusus Scheidw. POWO/Kew treats the name as accepted, and GBIF places it at species rank in the genus Ariocarpus.

Astrophytum myriostigma is one of the most recognizable spineless cacti in cultivation. It is loved for its star-shaped rib structure, smooth body and pale flecked surface rather than for dramatic spines. The commercial product name “Bishop’s Cap Cactus” is clear and useful for buyers; the botanical dictionary keeps the scientific name Astrophytum myriostigma Lem. POWO/Kew treats the name as accepted and records the native range as northeastern Mexico. World Flora Online also reports the name as accepted in Cactaceae.

Echinopsis 'Chocolate' should be treated as a horticultural cultivar or trade form, not as a formally accepted wild species name. On the product page, “Chocolate Cactus” is a clear buyer-facing name. In the botanical dictionary, the display name can be Echinopsis 'Chocolate', with an explicit note that it is a collector/cultivar name used around Echinopsis material rather than a settled species-level taxon.

Ferocactus latispinus is a strongly spined barrel cactus known for its flattened, often reddish central spines and compact architectural body. On the commercial product page it is presented with the buyer-friendly name “Devil’s Tongue Cactus”; in the botanical dictionary, the record keeps the scientific name. Current botanical references treat Ferocactus latispinus (Haw.) Britton & Rose as an accepted species in Cactaceae. GBIF places it at species rank in the genus Ferocactus and lists a range of older names and synonyms around the same taxon.

Astrophytum myriostigma var. nudum is a cleaner green, reduced-flecking form of Astrophytum myriostigma, the Bishop's Cap cactus. It should not be presented as Star Cactus; Star Cactus belongs to the Astrophytum asterias line.

Astrophytum asterias is a small, spineless, flattened cactus with a clean star-like body and orderly woolly areoles. The product name “Star Cactus” or “Sand Dollar Cactus” is clear for buyers, while the botanical dictionary keeps the scientific basis: Astrophytum asterias (Zucc.) Lem. POWO/Kew treats the name as accepted and records a narrow native range from southern Texas to Nuevo León and Tamaulipas in Mexico. World Flora Online also reports the name as accepted in Cactaceae.