Oncidium powellii Schltr., Repert. Spec. Nov. Regni Veg. Beih.17: 86–87. 1922.
TYPE: Panama. an den Hinterwässern des Gatun-Sees unweit Panama-City, C.W. Powell 58 (holotype, B, destroyed; lectotype designated by Christenson (1991), AMES; isolectotypes K, MO; drawing of type, AMES)