Vascular Plants - Orchidaceae - Platanthera:
Page Author: David Giblin
Platanthera dilatata
Blooms: June-September
Habit: herb
Duration: perennial
Origin: Native
Conservation Status: Abundant; of no concern.

Distribution: Widely distributed through the mountainous and forested areas of Washington; Alaska south to California, east to the Rocky Mountains; also in northeastern in North America.
Habitat: Wet meadows, forest openings, and streambanks from low elevations to the subalpine.
Species Description:

General: Herbaceous perennial with single, densely flowered inflorescences up to 3 ft. tall.
Leaves: Simple, alternate, glabrous, lanceolate, tapering in width from base to tip.
Flowers: Sepals and petals white, sepals widely spreading, two of the petals upright and arching, forming hood-like appearance; lip widest at base and often hanging downward, spurred at base.
Fruits: Capsules, brown at maturity and containing large numbers of tiny seeds.

Distinguishing Characteristics: Flowers with a sweet, spicy fragrance; plants often growing together in fairly large numbers.
Subspecies & Varieties:
Accepted Name:
Platanthera dilatata (Pursh) Lindl. ex L. C. Beck
Synonyms:
(none)

Treated in Flora of the PNW as:
Additional Resources:

PNW Herbaria Specimens: View list of Platanthera dilatata specimens in the Consortium of Pacific Northwest Herbaria database.

WTU Herbarium Specimens: View list of Platanthera dilatata specimens in the WTU Herbarium database.

Washington Flora Checklist: Platanthera dilatata treatment.

E-Flora BC: Platanthera dilatata atlas page.

CalPhotos: Platanthera dilatata images.

USDA Plants Database: Platanthera dilatata.
Additional photographs of Platanthera dilatata:
(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

Ben Legler, 2004

Ben Legler, 2004

Jim Riley

Dana Visalli

Dana Visalli

Dana Visalli

H. Tim Gladwin, 1985

H. Tim Gladwin, 1983

H. Tim Gladwin, 1983

H. Tim Gladwin, 1983

H. Tim Gladwin, 1983

H. Tim Gladwin, 1990

Bud Kovalchik

Tim Hagan, 2003

G. D. Carr, 2006

G. D. Carr, 2006

G. D. Carr, 2006

G. D. Carr, 2006

G. D. Carr, 2006

G. D. Carr, 2006

G. D. Carr, 2006

G. D. Carr, 2006

G. D. Carr, 2008

G. D. Carr, 2008

G. D. Carr, 2008

G. D. Carr, 2008

Douglas Houck, 2009

Douglas Houck, 2009

Rod Gilbert, 2006

Rod Gilbert, 2006

Rod Gilbert, 2007

Rod Gilbert, 2007

Ray Izumi, 2009

Ray Izumi, 2012

Ray Izumi, 2012

Ray Izumi, 2012

Ray Izumi, 2012

Ray Izumi, 2012

Ray Izumi, 2010

Ray Izumi, 2010

Ray Izumi, 2010

Ray Izumi, 2010

Ray Izumi, 2010

Ray Izumi, 2010

Ray Izumi, 2010

Ray Izumi, 2010

Ray Izumi, 2010

Ray Izumi, 2010

Ray Izumi, 2009

Ray Izumi, 2009

Susan McDougall, 2004

Susan McDougall

Ron Bockelman, 2011

Ron Bockelman, 2011

Ron Bockelman, 2011
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Washington Native Plant Society
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