Palm and Cycad
Central Florida Palm and Cycad Society, International Palm Society, Palm and Cycad Societies of Florida, Palm Beach Palm and Cycad Society, Palm Society of South Texas, The European Palm Society, West Coast Cycad Society
American Conifer Society
Association for the development, conservation, and propagation of conifers, with an emphasis on those that are dwarf or unusual. Photo gallery, database, information about membership and journal.
British Conifer Society
Organization for gardeners and collectors of ornamental, dwarf and rare conifers, owners and managers of arboreta and nurseries, and professional botanists. Photo gallery and database, excerpts from the journal.
California Macadamia Society
Non-profit corporation dedicated to promoting the advancement and improving the culture and production of the Macadamia nut.
Magnolia Society International
A worldwide organization of gardeners, nurserymen and other people who are devoted to the appreciation and study of magnolias.