Websites

Native Plants
Native Plant Society of Washington
The Berry Botanic Garden

Invasive & Non-native Plants
Natural Resources and Conservation Service, USDA
Noxious Weed Home Page, USDA

Ecoregions
Ecoregions_of_the_United_States, USEPA
Level_3_Ecoregions, USEPA

Oregon's Ecoregions (FTP link)