Anacheilium simum (Dressler) Withner & P.A.Harding, Cattleyas & Relatives: Debatable Epidendrums: 116 (2004).

* Encyclia sima Dressler, Orquideologia 4: 91 (1969).
Epidendrum simum (Dressler) P.Taylor, Bot. Mag. 182: 39 (1978).
Prosthechea sima (Dressler) W.E.Higgins, Phytologia 82: 381 (1997 publ. 1998).