Mammillaria vetula subsp. gracilis (Pfeiff.) D.R.Hunt, Mammillaria Postscripts 6: 6. 1997
Mammillaria vetula subsp. gracilis, Mammillaria Postscripts 6: 6. 1997
is new combination for Mammillaria gracilis in Allg. Gartenzeitung 6: 275. 1838
Mammillaria vetula subsp. gracilis, Mammillaria Postscripts 6: 6. 1997