Missouri Botanical Garden - Plantfinder page for one of the plants growing at the garden, with usually one or more photos, horticultural information, and noteworthy characteristics. (zone 5-9) (35 photos). Also a page for 'SMNHMRF' TEMPLE OF BLOOM.
Rainy Side Gardeners - Plant profile compiled by two gardeners in the Pacific Northwest. Includes propagation and pruning methods, and commentary. (zone 5-8) (4 photos)
Rob's Plants - Plant profile with basic horticultural information and often personal observations. (zone 5-9) (5 photos)
Virginia Tech Dendrology - Factsheet with botanical characteristics and photos of various features. (6 photos)