Orchids are among the most popular and widely collected of plant families, with tropical species and hybrids cultivated all over the world. In Genera Orchidacearum, Volume One, a comprehensive, robust classification of orchids is provided with descriptions of individual species and cultivational information. It includes comprehensive coverage on Cypripedioideae, the slipper orchids--one of the most attractive and popular of all. Superbly illustrated with contributions from over 50 international experts, this volume is indispensable for scientists, breeders, and collectors.