Cephalocereus machrisii E.Y.Dawson in Los Angeles County Mus. Contr. Sci. 10: 1, pl. 1–3. 1957
Cephalocereus machrisii in Los Angeles County Mus. Contr. Sci. 10: 1, pl. 1–3. 1957
is basionym for Pilosocereus machrisii, Cactaceae 4: 2419. 1960
is basionym for Pseudopilocereus machrisii in Succulenta (Netherlands) 56: 90. 1977
is basionym for Pseudopilocereus machrisii in Beitr. Biol. Pflanzen 44: 252. 1968