Gymnocalycium cardenasianum var. pseudocrassispinum Milt variety synonym Gymnocalycium cardenasianum subsp. armatum (F.Ritter) V.Gapon & Vikulov subspecies synonym Echinocactus loricatus Speg. species heterotypic synonym Gymnocalycium spegazzinii f. unguispinum Slaba form synonym Gymnocalycium spegazzinii var. tortispinum Y.Itô, 1981 variety accepted Gymnocalycium spegazzinii subsp. sarkae Halda & Milt subspecies synonym Gymnocalycium spegazzinii var. punillense H.Till & W.Till variety synonym Gymnocalycium spegazzinii subsp. cardenasianum (F.Ritter) R.Kiesling & Metzing subspecies accepted Gymnocalycium spegazzinii var. armatum (F.Ritter) Slaba & Sorma variety synonym Gymnocalycium loricatum Speg. species synonym Gymnocalycium horizonthalonium Fric ex Kreuz. species synonym Gymnocalycium cardenasianum f. armatum (F.Ritter) H.Till & Amerh. form synonym Gymnocalycium armatum F.Ritter species synonym Gymnocalycium spegazzinii var. spegazzinii variety accepted Gymnocalycium spegazzinii subsp. spegazzinii subspecies accepted Gymnocalycium cardenasianum F.Ritter species synonym Gymnocalycium cardenasianum subsp. pseudoarmatum V.Gapon & Vikulov subspecies synonym Gymnocalycium spegazzinii subsp. armatum (F.Ritter) Halda & Sorma subspecies synonym Gymnocalycium horizonthalonium Fric species homotypic synonym |