International Lilac Society -- http://lilacs.freeservers.com/
Formed in 1971 to stimulate interest in the genus Syringa and to promote its use in public and private landscaping.
National Chrysanthemum Society -- http://www.mums.org
Promotes the propagation and cultivation of the chrysanthemum and increase the bonds of fellowship among growers of the chrysanthemum.
American Hibiscus Society -- http://www.americanhibiscus.org/
Includes membership information, publications, chapter locations, events, and links.
American Brugmansia and Datura Society -- http://www.americanbrugmansia-daturasociety.org/
Offers culture information, searchable plant database, registry and photographs.
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