Trichocereus in Boll. Reale Orto Bot. Palermo 8: 236. 1909 sec. Hunt 2016
- ≡Cereus subg. Trichocereus in Rep. (Annual) Missouri Bot. Gard. 16: 73. 1905 syn. sec. IPNI 2000+: 25 feb 2021
- Type: Trichocereus macrogonus
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.
Excluded from Echinopsis by Schlumpberger & Renner (2012); cf. also Hunt (2016), CITES Cactaceae Checklist 3rd edition; see also note under Echinopsis.A