Mammillaria karwinskiana subsp. beiselii (Diers) D.R. Hunt Mammillaria karwinskiana subsp. beiselii (Diers) D.R. Hunt, Mammillaria Postscripts 6: 11. 1997 sec. Hunt 2016=Mammillaria beiselii Diers in Kakteen And. Sukk. 30: 60. 1979 syn. sec. Hunt 2016