Cactus densispinus J.M.Coult. in Contr. U.S. Natl. Herb. 3(2): 96–97. 1894
Cactus densispinus in Contr. U.S. Natl. Herb. 3(2): 96–97. 1894
is basionym for Mammillaria densispina in Cactography 7. 1926
is basionym for Neomammillaria densispina, Cactaceae 4: 119–120, f. 126. 1923
is basionym for Leptocladia densispina in Oesterr. Bot. Z. 98: 82. 1951
is basionym for Krainzia densispina in Sukkulenty 3: 43. 2000