Grusonia

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Grusonia

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

Content

Acknowledgments

Revised by Carlos Gómez-Hinostrosa, Héctor M. Hernández and Lucas C. Majure

Notes

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 Micropuntia (formerly Grusonia pulchella) was sister to a Grusonia and Cylindropuntia clade, and thus, should be recognized as a monotypic genus. See also notes under Cylindropuntia and Micropuntia.A

Taxon standing

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.

Bibliography

A. Majure, L.C. 2021: Revisions of Cochemiea, Consolea, Coryphantha, Cylindropuntia, Cumarinia, Grusonia, Kroenleinia, Leptocereus, Melocactus, Micropuntia, Opuntia. – In: Korotkova N. & al., Cactaceae at Caryophyllales.org – a dynamic online species-level taxonomic backbone for the family. – Willdenowia 51: 251-270