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Native Plant Identification

Flora of North America
Identification keys and line drawings for North America's flora.

Integrated Taxonomic Information System
The ultimate resource for determining what a current Latin name is for plants and animals.

U.S. Department of Agriculture Forest Service Silvics Manual
Extensive information on tree species with identifying characteristics, photos, references.

Virginia Tech's Dendrology web site
Online keys by leaf or twig for identifying woody plants.