Catasetum ×steyermarkii (Catasetinae: Orchidaceae) a New Putative Natural Hybrid of Catasetum (Catasetinae, Orchidaceae) from the Venezuelan Guayana

Based on evidence found in a specimen collected by J. A. Steyermark in the vicinity of Mount Roraima in 1944, such as the described colors of the flowers and shape of the labellum, and the shape and size of the antennae, the pollinarium, and the pollinia, a new natural hybrid between Catasetum discolor and C. planiceps is described and illustrated as C. ×steyermarkii. Both putative parents have been collected in the same area. An annotated list of all the species of Catasetum hitherto reported in the vicinity of Mount Roraima is presented in Appendix I, and new nothospecies (pro sp.) and a nomenclatural notes in Appendix II.