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Marshallocereus Backeb. in Cact. Succ. J. (Los Angeles) 22: 154. 1950 sec. Arias 2021


Revised by Salvador Arias


Phylogenetics: Some phylogenetic analyses and taxonomic studies confirm that Marshallocereus belongs to the Pachycereinae subtribe, but its relationship with Cephalocereus and Pachycereus is still uncertain (Arias & al. 2003; Arias & Terrazas 2006, 2009). Its distribution is one of the southernmost of Pachycereinae, in the Mesoamerican region (Mexico to Costa Rica). The recognition of more than one species is not resolved.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.


A. Arias, S. 2021: Revisions of Acanthocereus, Aporocactus, Astrophytum, Bergerocactus, Cephalocereus, Disocactus, Marshallocereus, Nyctocereus, Pachycereus, Peniocereus, Pereskiopsis, Selenicereus, Stenocereus, Strophocactus. – In: Korotkova N. & al., Cactaceae at – a dynamic online species-level taxonomic backbone for the family. – Willdenowia 51: 251-270