Systematics of subgen. Pleurothallis, sect. Abortivae, sect. Truncatae, sect. Pleurothallis, subsect. Acroniae, subsect. Pleurothallis, subgen. Dracontia, subgen. Unciferia : Addenda to Dracula, Lepanthes, Masdevallia, Porroglossum, and Scaphosepalum
Carlyle A. Luer
Bok Engelsk 1998