Published in association with the Royal Botanic Garden, Edinburgh, on the basis of its extensive research, this authoritative reference offers keys to identifying 295 Rhododendron species in cultivation. After introducing the nature and history of plant classification, and the structure and current classification of the genus, Cullen (Stanley Smith Horticultural Trust, Cambridge, UK) describes subgenera per their growth habit, parts, distribution, flowering time, hardiness zone, and wild and cultivated species. Color photos, summary tables, and plant characteristic lists (e.g., scaly vs. nonscaly species) are additional identification aids. Annotation ©2006 Book News, Inc., Portland, OR (booknews.com)