| About.com: Top 100 Trees: Find information on more than 100 trees in North America |
| Ariadne's Trees and Forests: Glossary of tree-related terms; articles on California trees, hiking, and meditation. |
| British Trees: Guide to the native trees of Britain, plus links to other web resources on forestry and conservation of British Native trees, including forest conservation organizations. |
| Catalog of the Woody Plants of Oklahoma: Descriptions, images, and range maps. |
| Common Trees of Pennsylvania: Guide to common trees with laymans descriptions of each tree, and a simple key to start with. Line drawings of leaves and fruit. |
| Conifers in the Pacific Northwest: A site that covers common conifers only. Uses an interactive web based dichotomous key. |
| Forest Trees of Florida: Descriptions and images of over 70 species. |
| Goo's Tree Encyclopedia: Names and illustrations of Japanese trees. |
| Identification of Common Trees of Iowa: An interactive guide to trees, using a simple visual dichotomous key. |
| Identifying Trees of Michigan: A page on the common trees of Michigan with a key. |
| The Tree Register of the British Isles: Historical, ancient, and biggest trees of Great Britain and Ireland. |
| Tree Atlas of the Panama Canal Watershed: Species accounts with images and maps, arranged by scientific name, tanomomy, and common name. In English and Spanish. |
| Trees and Shrubs of Ontario: Designed to assist those interested in learning some of the common trees and shrubs found in the province. |
| Trees of Alabama and the Southeast: Brief text and numerous photos of both native and planted trees. Includes section illustrating terminology with photographs. |
| Trees of Eastern North American Forests: Descriptions and images of various trees native to the eastern forests of North America. |
| Trees of Ilalo: Photographic guide to the trees of Ilalo, a mountain in the inter-Andean Valley near Quito, Ecuador. |
| Trees of Ottawa: A photographic index of tree species that grow in Ottawa, Ontario, Canada. |
| Trees, Shrubs, and Woody Vines of North Carolina: Photographs and information on over 160 species, identification key, and full species list for the state. |
Classical
