Grusonia Rchb.f. ex Britton & Rose, Cactaceae 1: 215. 1919 sec. Majure 2021



Phylogenetics: Corynopuntia was included in Grusonia s.l. (Wallace & Dickie 2002); Anderson 2001, 2005; Nyffeler & Eggli 2010), then accepted as separate genus by Hunt (2006). Griffith & Porter (2009) argue for recognizing Corynopuntia as a distinct genus, and Grusonia as monotypic, although support for the monophyly of Corynopuntia was only 67% BS in their study. Their data also suggest that Micropuntia could be recognised as a separate genus. Bárcenas & al. (2011) do not find support for treating Corynopuntia separate from Grusonia, and in addition find no support for a monophyletic Corynopuntia. Majure & al. (2019) showed that the characters used to separate Corynopuntia from Grusonia are either plesiomorphic or convergent, thus, there is no clear reason for separating these taxa into two genera. However, they did show that the genus Grusonia (formerly Grusonia pulchella) was sister to a Grusonia and Corynopuntia clade, and thus, should be recognized as a monotypic genus. See also notes under Corynopuntia and Grusonia.A
A. Majure, L.C. 2021: Revisions of Cochemiea, Consolea, Coryphantha, Cylindropuntia, Cumarinia, Grusonia, Kroenleinia, Leptocereus, Melocactus, Micropuntia, Opuntia. – In: Korotkova N. & al., Cactaceae at – a dynamic online species-level taxonomic backbone for the family. – Willdenowia 51(2): 250-270