Range Distribution Maps: A Synonymized Checklist of the Vascular Flora of the United States, Canada and Greenland - BONAP & Museum Informatics Project, University of California, Berkeley. Enter plant name, choose 'North American Distribution Map' and 'Submit Query'.
Range Distribution Lists: Flora of North America Online Treatments: (Ferns and Fern allies) Pteridophytes, Conifers (Gymnosperms), Magnoliophyta.
Checklist of the Vascular Plants of Maryland James L. Reveal, UMD PBIO 250 Lecture Notes
Flora of the Washington-Baltimore Area
QUERY the DC Herbarium of the National Museum
Non-Native Plants of Delaware Delaware Natural Heritage Program, June 2001
List of Submerged Aquatic Vascular Plants in the Chesapeake Bay VIMS, 1995
What Plants Grow Where New Jersey / New York City Vicinity
Species in Parks National Park Service Flora and Fauna Database Online Query System
Flora of Roosevelt, Monmouth County, New Jersey
BOOKS
Delaware
Flora of Delaware and the Eastern Shore by Robert R. Tatnall. 1946. The Society of Natural History of Delaware.
Maryland
Herbaceous Plants of Maryland by Melvin L. Brown and Russell G. Brown. 1984. College Park, MD: The Book Center, University of Maryland.
Woody Plants of Maryland by Russell G. Brown and Melvin L. Brown. 1972. College Park, MD: The University of Maryland Book Store.
New Jersey
New Jersey Wild Plants by Mary Y. Hough. 1983 et seq. Harmony, NJ: Harmony Press.
Pennsylvania
The Vascular Flora of Pennsylvania: Annotated Checklist and Atlas by Ann Fowler Rhoads and William McKinley Klein, Jr. 1993. Philadelphia, PA: American Philosophical Society.
Atlas of the Flora of Pennsylvania by Edgar T. Wherry, John M. Fogg, Jr. and Herbert A. Wahl. 1979. Philadelphia, PA: Morris Arboretum of the University of Pennsylvania
Virginia
Atlas of the Virginia Flora-III by A. M. Harvill, Jr., Ted R. Bradley, Charles E. Stevens, Thomas F. Wieboldt, Donna M. E. Ware, and Gwynn W. Ramsey, and Gary P. Fleming. Burkeville, VA: Virginia Botanical Associates.
West Virginia
Flora of West Virginia. Ed. 2 by P. D. Strausbaugh and Earl L. Core. [1978.] Grantsville, WV: Seneca Books.
Atlas of the Flora of New England