Plants:
Oregon Flora Project
Atlas of Oregon plant collections and observations, photo gallery, checklist, and in-progress updated flora of Oregon
Burke Museum herbarium
Washington atlas of collections, photo gallery, descriptions
Key to Ipomopsis of the PNW and photos
Discusses native, introduced, and hybridizing jewel weeds
Key to Knapweeds and Starthistles of the Pacific Northwest
An older reference first written in 1999, but it has excellent drawings and descriptions for many of our non-native Centaureas.
Pacific Northwest Wildflowers, Turner Photographics
Photos, general distributions, and descriptions
Flora of North America families list
Keys and technical descriptions for all plants in North America
Go Orchids
Keys, photos, descriptions of North America's native orchids.
Diagram of grass flower anatomy
Fungi:
The Helvella lacunosa species complex in western North America
Fungal Jungle keys and descriptons
South Vancouver Island Mycological Society keys to PNW fungi
Mushroom Observer
Large database of mushroom observations and discussions.
Mushroom Expert
Provides photos, descriptions, and keys to many mushroom groups in North America.
Birds:
Cornell Lab All About Birds
Americas distribution, photos, songs, descriptions
Mammals:
Oregon Wildlife Viewer (birds and herps too)
Oregon historic and current habitat, photos, descriptions, conservation status.
Oregon Dept. of Wildlife mammal page with brief species descriptions and photos.
Insects:
PNW Moths
Western Bumble Bees
Identification and Habits of Key Ant Pests in the Pacific Northwest
Poor title choice but a nice key and descriptions.
Pocket Guide to Willamette Valley Native Bees
Pretty limited info but a quick start to find a general bee category.
Native stink bugs and identification resources
From Oregon State University
Exotic wood borers in or potential to be introduced to Oregon by Jim LaBonte
Galls:
the species page for iNat’s Galls of California project
Gastropods
OSU Slug Portal
Land Snails and Slugs of Oregon poster from Oregon Dept. of Agriculture
Crustaceans
Invasive crayfish in Oregon from Oregon SeaGrant
Photo comparison and key characteristics for Oregon crayfish
Intertidal
Field Guide to Oregon's Rocky Intertidal. Fantastic photo-key resource across many taxa including algae compiled by Kate Krieg.
Mt Rainier:
MORA Nature and Science page
Vegetation Classification of Mt Rainier, North Cascades, and Olympic National Parks
Vascular Plant Inventory of Mount Rainier National Park published June 2010