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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.

Dedicated to the preservation, study, and dissemination of Passiflora.

Devoted to the study of new and rare ornamental landscape plants. Includes an online source guide and plant encyclopedia.

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 a question answering resource.

An international horticultural club interested in the species of all the genera of the Geraniaceae Family.