Mammillaria nejapensis var. longispina R.T.Craig & E.Y.Dawson in Allan Hancock Found. Publ. Occas. Pap. 2: 58. 1948
Mammillaria nejapensis var. longispina in Allan Hancock Found. Publ. Occas. Pap. 2: 58. 1948
is basionym for Mammillaria nejapensis f. longispina, Kakteen 18: C VIIIc. 1961
is basionym for Neomammillaria nejapensis var. longispina, Cactaceae: 619. 1981