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Acharagma aguirreana (Glass & R. Foster 1972) Glass 1998. Acharagma roseana (Boedeker 1928) E. F. Anderson 1999. This sort was recognized, among others by Glass in Cactaceous Threatened of Mexico in 1998, that supported the works of Zimmerman in this sense. It also appears in The Cactus Family, Anderson 1999. In the CITES list of Hunt it does not appear, and it includes its two species in Escobaria. Other denominations that have been receiving from their discovery in years 70 are those of Gymnocactus, Thelocactus, Neolloydia. It is significant what Jan Riha wrote in 1981 in his Small Encyclopedia of Cactus: “There are two species here: Gymnocactus aguirreanus and Gymnocactus roseanus, that does not belong to the Gymnocactus sort, of which despite, they take the name. Its systematic position clearly is not established”.
Glass says that they cannot be comprise of Gymnocactus (Turbinicarpus now) by the characteristics of his seeds and their nondehiscentes fruits. Following Glass, they cannot either be classified in Escobaria because they lack of well defined tubercles, of the typical furrows of the Escobaria, the segments of perianthus are not ciliated. In fact Acharagma means “without furrows”. Thus it was denominated by Nigel Taylor in 1983 to remark that it does not present/display the furrows characteristic of Escobaria, where it was included. Later studies of the DNA sequences confirm that Acharagma is a group different from Escobaria. They grow in the Mexico north, to the Southeast of Coahuila and the bordering zones again Leon. They are plants that can form small groups, but have a single globoso or cylindrical stem of up to 6 cm. of height and 7 cm. of diameter, smooth texture and without melifera glands. The ribs form soft tubercles. The spines are abundant and showy, of reddish in Acharagma aguirreana and yellow or brown color in Acharagma roseana.
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