Cactus tetragonus Linnaeus, Species Plantarum 1: 466. 1753.

"Habitat in Curacao, America calidiore." RCN: 3572.

Type not designated.

Original material: none traced.

Current name: Acanthocereus tetragonus (L.) Hummelinck ( Cactaceae).

Note: Hummelinck (in Succulenta 20: 165. 1938) apparently designated two collections (Hummelinck 196 (fl.) and 170 (fr.)) as a neotype. The numbering suggests that these may not be part of a single gathering, which presumably renders this choice ineffective.