Gymnocalycium bayrianum Gymnocalycium bayrianum H.Till in Kakteen And. Sukk. 38(8): 191. 1987 sec. Charles 20091≡Gymnocalycium spegazzinii subsp. bayrianum (H.Till) Halda in Cactaceae etc. 9(3): 84. 1999 syn. sec. Charles 200911. Charles, G. 2009: Gymnocalycium in habitat and culture. – Stamford: Published by the authorContent