- American Chestnut Foundation, The
 - Contains information on chapters, history, identification, and more. Dedicated to restoration and preservation. - Autumn Leaf Scrapbook
- Online gallery and tree identification guide inspired by a walk through the Missouri Botanical Garden.
- Basics of Tree Identification
- Provides information on identifying trees by leaf, bark, fruit, twig, and form.
- Common Trees of Pennsylvania
- Identification information.
- Dendrology at Virginia Tech: ID It
- Interactive keys for identifying trees by leaf and twig.
- eNature.com: Trees
- Photographic nature field guides for trees, sorted by leaf type: needle-leaf conifers, scale-leaf conifers, untoothed simple leaves, toothed simple leaves, lobed simple leaves, compound leaves, and palms.
- Foliage Vermont: Identifying the Leaves of Vermont Foliage
- Information on recognising common Vermont trees during the fall foliage season.
- Identification of Common Trees of Iowa: An Interactive Key
- Interactive key to aid in identifying the most common trees in Iowa. Includes information on leaves, fruits, and bark.
- Key to Leaves of Virginia Trees
- Interactive photographic key to identifying Virginia trees.
- Leaf Identification
- Instructional unit from the Department of Horticulture at Penn State University. Includes information on identifying leaves by structure, shape, groupings, margins, and arrangement.
- Natural Resources Skills: Introduction to Tree Identification
- Offers definitions and a guide to the basics of tree identification, including common leaf and bud types.
- Temperate Deciduous Forest: Leaf ID
- Mini-guide to identifying particular trees by the shape of their leaves.
- Tree Anatomy and Identification - About.com
- Article and collection of online resources for identifying trees. Includes an online interview to identify the leaves of fifty common native North American trees.
- Trees of the Pacific Northwest
- Tree identification home page at Oregon State University.
- What Tree Is It?
- You see an unknown tree. Or perhaps you've found part of a tree, and you want to know what kind of tree it came from. The focus is on common trees of Ohio.
- What Tree is That?
- Resources from the National Arbor Day Foundation for identifying trees in the Eastern, Central, and Western United States.
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