Espostoopsis Buxb. in Krainz, Kakteen: 38-39, C Va. 1968 sec. Taylor & Zappi 2004



Monotypic genus, endemic to the caatinga of Bahia, SE Brazil. Hernández-Hernández & al. (2011) found E. dybowskii within an unsupported Trichocereeae clade, as sister to Rauhocereus (no support), while Schlumpberger & Renner (2012) found E. dybowskii as sister to Micranthocereus densiflorus with 78% MLBS support. Espostoopsis is therefore not closely related to the Andean genus Espostoa, a relationship that had been suggested earlier based on the strong morphological similarities of the two genera.A
A. Korotkova, N., Aquino, D., Arias, S., Eggli, U., Franck, A., Gómez-Hinostrosa, C., Guerrero, P.C., Hernández, H.M., Kohlbecker, A., Köhler, M., Luther, K., Majure, L.C., Müller, A., Metzing, D., Nyffeler, R., Sánchez, D., Schlumpberger, B. & Berendsohn, W.G. 2021: Cactaceae at – a dynamic online species-level taxonomic backbone for the family. – Willdenowia 51(2): 251-270