PDFs to download
Other Keys and ID sites
Maryland Biodiversity Project, lists plants and other biota and contains links to photos.
Flora of Virginia The first manual on Virginia plants in 250 years. Published in 2012, featuring 3,164 species, almost 1,600 pages, and 1,400 original illustrations, with keys and excellent habitat information. $96.49 (including S&H).
Native Plant Center, Chesapeake Region, based on the publication Native Plants for Wildlife Habitat and Conservation Landscaping published by the U.S. Fish and Wildlife Service.
Compare the involucral bracts of sunflowers. A pictorial guide for identification of Helianthus species.
The Biota of North America Program, from the North Carolina Botanical Garden.
Dr. Duke's Phytochemical and Ethnobotanical Databases, from a scientist at USDA, Agricultural Research Service.
Forest Biology and Dendrology at Virginia Tech, facts on over 450 species of trees.
NatureServe Explorer, a database with information on 50,000 plants, animals, and communities.
PLANTS Database, USDA, Natural Resources Conservation Service.
Lady Bird Johnson Wildflower Center at the University of Texas, Austin, has lots of photos; many plants are western but many have a wide range that includes our area. Search by family name or scientific name and other characteristics.
Southeastern US Plant Identification Resource, created by John. R. Gwaltney, contains many searchable photos of plants of the southeastern US, which include plants in our range.
LeafSnap, an electronic field guide to the trees of the U.S., available for iPhone and iPad.