Order Caryophyllales, Family Cactaceae, Subfamily Cactoideae
中刺は1〜4本、縁刺は28〜36本で、いずれも細毛がある。花は淡黄色で直径15〜20mm。
Distribution range: Mexico (Guanajuato, San Luis Potosí)
Si level: the genus existed in 2003 or 1986 edition, but not listed in 2019 edition. (S level implied, 303 genera)