Nyctocereus in Contr. U.S. Natl. Herb. 12: 423. 1909 sec. Arias & Aquino 2019
- Type: Nyctocereus serpentinus
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.
Phylogenetics: Nyctocereus is a sister taxon of Bergerocactus and other genera of Pachycereinae, but it is not part of Peniocereus (Arias & al. 2005). Nyctocereus is characterized by cylindrical, monomorphic, medium-wide stems (3 to 6 cm), as well as distinctively long (15 to 19 cm) and white flowers. Monotypic.A
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 Caryophyllales.org – a dynamic online species-level taxonomic backbone for the family. – Willdenowia 51: 251-270