Heliconia Society of Puerto Rico: Offers photo gallery and online newsletter.
Native Orchid Conservation Inc.: NOCI is a non-profit group dedicated to habitat protection, study and appreciation of native plants and their ecosystems.
North American Native Plant Society: Dedicated to the study, conservation, cultivation and restoration of native plants. Join us in our celebration of the unique botanical heritage of North America.
Plantlife: The Wild-Plant Conservation Charity: A membership organisation solely dedicated to saving wild plants and their habitats.
Useful Wild Plants: Project coordinated around Austin, Texas, to document plants native to the Southern United States and Northern Mexico in a multi-volume encyclopedia. Information about activities and volunteering.
Wild Flower Society: Society for amateur botanists/wild flower lovers in the UK.