Botanical Electronic News (Victoria, B.C.)
Marion Ownbey Herbarium
Oregon Native Plant Society
University of British Columbia Botanical Garden
University of Washington Herbarium Database
Washington Flora Checklist
Washington Native Plant Society
Washington State University - Native Plants
WSU Mt. Vernon Research and Extension Center  

Botanical Society of America
Flora of North America
USDA Plants National Database

Other Local Sites
Friends of the Forest (Anacortes Community Forest Lands)
Skagit Audubon Society