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 6-9) (3 photos)
Texas A&M Native Trees - Brief plant profile with horticultural details (zone 8) (4 photos)
Trees and Shrubs Online - Reference page curated by the International Dendrology Society with descriptive characteristics and horticultural notes. (3 photos)
Virginia Tech Dendrology - Factsheet with botanical characteristics and photos of various features. (5 photos)
(2 photos)