Since the publication of my revision of this genus (Mem. N. Y. Bot. Gard.
8:257-342. 1953), it has been necessary to publish an urgent nomenclatural note
Brittonia 8:113. 1955), and now a number of new species have been recognized
in recent collections made on New York Botanical Garden Expeditions in Venezuela.
The new taxa are arranged in the approximate order they would have occupied
in the revision; a revised key will be published to include all subsequent
modifications when it appears that the rate at which new taxa are being collected
has leveled off.