[Picture of <em>Carex densa</em>]

General U.S. Plants
Flora of North America on-line
USDA Plants

Oregon Plants
Herbarium, Oregon State University
Oregon Flora Project
Oregon Plant Atlas

California Plants
Jepson Interchange

Washington Plants
Herbarum, University of Washington
Herbarium, Washington State University
Washington Carex Atlas

British Columbia Plants
BC e-Flora

Nomenclature
IPNI - International Plant Names Index
W3Tropicos

Systematics
Angiosperm Phylogeny Website

Finding Herbaria
Index Herbariorum