Echinocereus, Mem. Tour N. Mexico: 91. 1848 sec. Sánchez & al. (2014)
Echinocereus was studied in detail and found as monophyletic by Sánchez & al. (2014) but excluding E. pensilis J. A. Purpus, which was resolved distant from Echinocereus and as as sister to the Stenocereus group. Because E. pensilis had been regregated as a monotypic genus Morangaya, its reinstatement was suggested by Sánchez & al. (2014).