Herbaria
Index Herbariorum - Search Search by abbreviation, name, person or expertiseHerbaria online University of New Mexico, listed alphabetically by Index Herbariorum abbreviation
Index Herbariorum - USA alphabetical by name
Mid Atlantic Herbaria - Hotlines
West Virginia University Herbarium
Norton-Brown Herbarium University of Maryland
University of North Carolina Herbarium
Claude E. Phillips Herbarium Delaware State University
Herbarium of the Patuxent Research Refuge USGS, Laurel, MD
Gymnosperms in the Herbaria New York Botanical Garden
Smithsonian US Wood Collection
Smithsonian - Botany Department
QUERY the DC Herbarium of the National Museum
John Clayton Herbarium Historic collections
Arboretum & Gardens
American Association of Botanic Gardens and Arboreta
Frederick G. Meyer, Peter M. Mazzeo, and Donald H. Voss. 1993. A Catalogue of Cultivated Woody Plants of the Southeastern United States. US Department of Agriculture, Agricultural Research Service, US National Arboretum Contribution No. 7. 338 pp; {Note: of Mid-Atlantic States, covers Delaware, Maryland, Virginia only}
Index Xylariorum. Institutional Wood Collections of the World, 3 (International Association of Wood Anatomists Bulletin 9[2]:203-252.) Leiden, the Netherlands: IAWA
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