Myrtillocactus in Boll. Reale Orto Bot. Giardino Colon. Palermo 1: 10. 1897 sec. Hunt 2006
Category B. The genus is monophyletic based on phylogenetic studies that support the clade based on a sufficiently dense or even complete sampling, or support a monotypic genus as a distinct lineage, but do not provide a new taxonomic treatment at the species level. In many cases, older classical taxonomic synopses or a monographic treatment exist for these genera providing a reliable assessment of the species included.
Myrtillocactus schenkii and M. geometrizans were sampled by Arias & al. (2005) and were resolved sister to each other and in a polytomy with Polaskia chichipe, Myrtillocactus and Stenocereus. Hernández-Hernández & al. (2011) found a similar topology, with Myrtillocactus sister to a clade of Stenocereus, Polaskia, Escontria, and Isolatocereus, albeit with support <50%.A
A. Korotkova, N., Aquino, D., Arias, S., Eggli, U., Franck, A.R., Gómez-Hinostrosa, C., Guerrero, P.C., Hernández, H.M., Kohlbecker, A., Köhler, M., Luther, K., Majure, L.C., Metzing, D., Müller, A., Nyffeler, R., Sánchez, D., Schlumpberger, B.O. & Berendsohn, W. G. 2021: Cactaceae at Caryophyllales.org – a dynamic online species-level taxonomic backbone for the family. – Willdenowia 51: 251-270