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.