Dave's Garden PlantFiles - Profile page with horticultural basics, and member-contributed photos and comments. (zone 3-8) (2 photos)
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 3-7)
Virginia Tech Dendrology - Factsheet with botanical characteristics and photos of various features. (zone -1--1) (6 photos)