American Association of Botanical Gardens and Arboreta: http://www.aabga.org/

American Chestnut Foundation: http://www.acf.org/

CAMCORE program at North Carolina State University: http://www.camcore.org/

Center for Plant Conservation: http://www.centerforplantconservation.org/

Climate Change Atlas for 80 Forest Tree Species of the Eastern United States (from the U.S. Forest Service Northeastern Research Station): http://www.fs.fed.us/ne/delaware/atlas/

Convention on Biological Diversity: http://www.biodiv.org/welcome.aspx

The Franklinia (Franklinia alatamaha) Story (from Bartram's Garden, Philadelphia, Pa.): http://www.bartramsgarden.org/franklinia/

Gymnosperm Database: http://www.botanik.uni-bonn.de/conifers/taxa.htm

IUCN (The World Conservation Union) Red List of Threatened Species: http://www.redlist.org/

J.C. Raulton Arboretum at North Carolina State University: http://www.ncsu.edu/jcraulstonarboretum/

National Invasive Species Information System: http://www.invasivespecies.gov/

"National Vegetation Classification System: Development, Status, and Applications" (report by The Nature Conservancy): http://conserveonline.org/2001/03/p/en/vol1.pdf

The Nature Conservancy, North Carolina Chapter: http://nature.org/wherewework/northamerica/states/northcarolina/

The Nature Conservancy, Conservation by Design framwork: http://nature.org/aboutus/howwework/cbd/

NatureServe: http://www.natureserve.org/

NatureServe Explorer (information about rare and endangered North American species): http://www.natureserve.org/explorer/

NatureServe explanation of conservation rankings: http://www.natureserve.org/explorer/ranking.htm

North Carolina Botanical Garden: http://www.ncbg.unc.edu/

North Carolina Department of Agriculture Plant Conservation Program: http://www.agr.state.nc.us/plantind/plant/conserv/cons.htm

North Carolina Native Plant Society: http://www.ncwildflower.org/

North Carolina Natural Heritage Program: http://www.ncnhp.org/

North Carolina Natural Heritage Program's List of Rare Plant Species of North Carolina: http://www.ncnhp.org/Images/Other%20Publications/2004%20Rare%20Plant%20List.pdf

Pennantia baylisiana: New Zealand's Rarest Tree (from the Royal New Zealand Institute of Horticulture): http://www.rnzih.org.nz/pages/pennantia.htm

Toromiro (Sophora toromiro) Management Group (from the Royal Botanic Gardens at Kew): http://www.rbgkew.org.uk/conservation/cpdu/Toromiro/toro_t1.html

University of Rhode Island Medicinal Plant Garden: http://www.uri.edu/pharmacy/garden/

U.S. Department of Agriculture Forest Service Silvics Manual: http://www.na.fs.fed.us/spfo/pubs/silvics_manual/table_of_contents.htm

U.S. Department of Agriculture PLANTS database: http://plants.usda.gov/cgi_bin/

U.S. Fish and Wildlife Service Endangered Species Program: http://endangered.fws.gov/

U.S. Forest Service Regional Invasive Exotic Plant Species List: http://www.se-eppc.org/fslist.cfm

The Vascular Flora of North Carolina: http://www.hawriverprogram.org/NCPlants/Vascular_flora_page.html