 Regional
New England Botanical Club
The New England Botanical Club (NEBC), which originated in 1895, is a non-profit organization that promotes the study of plants of North America, especially the flora of New England and adjacent ...
http://www.rhodora.org/
United States Wide
American Fern Society
The American Fern Society
http://amerfernsoc.org/
National Gardening Association
Extensive resources for gardeners of all levels, including regional reports, Q&A, articles, how-to projects, gardening with kids, events calendar, message boards, and links to related National ...
http://www.garden.org/
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