ORBIC Rare Plant Field Guide
: Provides detailed information on federally or state listed threatened and endangered species.
Oregon Vascular Plant Atlas
: This Oregon Flora Project website allows you to create your own native plant distribution maps.
Native Plant Society of Oregon
: Organization dedicated to the enjoyment, conservation and study of Oregon's native plants.
Center for Plant Conservation Plant Database
: Search for detailed plant profiles of the United States' rarest plants.
Berry Botanic Garden
: Information on Pacific Northwest native plants, plant collections and native endangered plant conservation.
: Information on more than 65,000 plants, animals, and ecosystems of the United States and Canada, including particularly in-depth coverage for rare and endangered species.
Institute for Applied Ecology
: Information on the institute's rare plant research projects.