Heliconia Society of Puerto Rico
   Offers photo gallery and online newsletter.
   http://www.heliconiasocietypr.org

Native Orchid Conservation Inc.
   NOCI is a non-profit group dedicated to habitat protection, study and appreciation of native plants and their ecosystems.
   http://www.nativeorchid.org

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.
   http://www.nanps.org

Plantlife: The Wild-Plant Conservation Charity
   A membership organisation solely dedicated to saving wild plants and their habitats.
   http://www.plantlife.org.uk/

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.
   http://www.usefulwildplants.org/