Vascular Plants - Dryopteridaceae - Dryopteris:
Dryopteris expansa
spreading woodfern, northern woodfern 
Habit: herb
Duration: perennial
Origin: Native
Distribution: Circumboreal; throughout the Pacific Northwest
Habitat: Moist to wet woods and streambanks
Accepted Name:
Dryopteris expansa (C. Presl) Fraser-Jenk. & Jermy
Synonyms:
Dryopteris assimilis S. Walker
Dryopteris dilatata (Hoffm.) A. Gray
Dryopteris dilitata (Hoffmann) A. Gray
Dryopteris dilitata (Hoffmann) A. Gray var. americana (Fischer) Hultén
Nephrodium expansum C. Presl

Treated in Flora of the PNW as:
Dryopteris austriaca (in part)
Additional Resources:

PNW Herbaria Specimens: View list of all Dryopteris expansa specimens in the Consortium of Pacific Northwest Herbaria database.

WTU Herbarium Specimens: View list of Dryopteris expansa specimens in the WTU Herbarium database.

Washington Flora Checklist: Dryopteris expansa treatment.

E-Flora BC: Dryopteris expansa atlas page.

CalPhotos: Dryopteris expansa images.

USDA Plants Database: Dryopteris expansa.
Additional photographs of Dryopteris expansa:
(click on a thumbnail to view larger photo)

Ben Legler, 2004

Ben Legler, 2004

Ben Legler, 2004

Ben Legler, 2004

Ben Legler, 2004

Ben Legler, 2004

Bud Kovalchik

Bud Kovalchik

Bud Kovalchik

Bud Kovalchik

Bud Kovalchik

Bud Kovalchik

Ed Alverson

Paul Slichter, 2008

Robert L. Carr, 2010

Robert L. Carr, 2010

Robert L. Carr, 2010

Robert L. Carr, 2010

Robert L. Carr, 2010
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