American Ivy Society
   A non-profit organization dedicated to preserving the genus Hedera through education and promotion. Site offers contact information, species photos with descriptions, a classification system, care instructions, article collection, membership details, and
   http://www.ivy.org/

Hebe Society
   International society based in Britain promoting the cultivation and conservation of hebes and other New Zealand native plants. Includes plant profiles and photos, FAQs, and links.
   http://www.hebesoc.org/

Passiflora Society International
   Dedicated to the preservation, study, and dissemination of Passiflora.
   http://www.passiflora.org/

Scottish National Sweet Pea Rose & Carnation Society
   Society home page with Sweet Pea and Rose trial results, flower show venue and reports.
   http://www.snsprcs.org.uk/