Dendrobium is an enormous orchid genus of more than 1000 species native to south Asia, Australia and New Zealand, and Oceania. They are highly popular among orchid growers for their beauty and diversity. This study by three plant scientists who are also active orchid growers presents more than 400 of the species, all illustrated with color photographs. Almost all the horticulturally popular species are included, along with some lesser-known but spectacular species recently discovered in the highlands of New Guinea that are likely to become popular in the future.