Vascular Plants - Salicaceae - Populus:
Populus tremuloides
Page Authors: Don Knoke, David Giblin
quaking aspen 
Blooms: April-June
Habit: tree
Duration: perennial
Origin: Native
Conservation Status: Abundant; of no concern.

Distribution: Broadly distributed in Washington, but chiefly east of the Cascades in Washington; Alaska to California, east to Labrador and New Jersey.
Habitat: Moist areas, low to fairly high elevations in the mountains
Species Description:

General: Colonial tree, dioecious, up to 15 m. tall, with smooth, greenish-white bark that becomes blackish and somewhat rough on very old trunks; bud scales shiny, but not resinous.
Leaves: Leaves alternate, relatively small, on slender, laterally-flattened petioles half to fully as long as the blade; blades rotund-ovate to reniform-cordate, 2.5-9 cm. long and 2.5-8 cm. wide, shortly acuminate, paler beneath, the margins finely toothed and hairy, the surfaces glabrous at maturity.
Flowers: Catkins drooping; the bracts subtending the flowers in the catkins persistent, deeply cleft into a few slender lobes with long, white hairs on the margins; staminate catkins elongating to 2-3 cm. then deciduous; stamens 6-14; pistillate catkins at maturity 4-10 cm. long, with numerous fruits; stigmas 2, each deeply cleft into 2 or more slender lobes.
Fruits: : Capsules lanceolate, 4-6 mm. long, on pedicles 1-2 mm. long
Accepted Name:
Populus tremuloides Michx.
Synonyms:
Populus tremula L.
Populus tremula L. ssp. tremuloides (Michx.) A.& D. Love

Treated in Flora of the PNW as:
Populus tremuloides
Additional Resources:

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

WTU Herbarium Specimens: View list of Populus tremuloides specimens in the WTU Herbarium database.

Washington Flora Checklist: Populus tremuloides treatment.

E-Flora BC: Populus tremuloides atlas page.

CalPhotos: Populus tremuloides images.

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

Clayton J. Antieau

Clayton J. Antieau, 1995

Clayton J. Antieau, 1995

Clayton J. Antieau, 1996

Clayton J. Antieau, 1988

Clayton J. Antieau, 2004

Ben Legler, 2004

Ben Legler, 2003

Ben Legler, 2003

Dana Visalli

Bud Kovalchik

Bud Kovalchik

Bud Kovalchik

Bud Kovalchik

Bud Kovalchik

Bud Kovalchik

Ben Legler, 2006

Ben Legler, 2006

Ben Legler, 2006

Ben Legler, 2006

Ben Legler, 2006

Ben Legler, 2006

Ben Legler, 2006

Ben Legler, 2006

Ben Legler, 2006

G. D. Carr, 1986

Clayton J. Antieau, 2007

Clayton J. Antieau, 2008

Clayton J. Antieau, 2007

G. D. Carr, 2009

G. D. Carr, 2009

G. D. Carr, 2009

G. D. Carr, 2009

G. D. Carr, 2009

Walter Siegmund, 2011

Susan McDougall, 2005

Susan McDougall, 2011

Susan McDougall, 2010

Susan McDougall, 2013

Ron Bockelman, 2013

Ron Bockelman, 2013

Ron Bockelman, 2013

Ron Bockelman, 2013

Ron Bockelman, 2013

Ron Bockelman, 2013

Ron Bockelman, 2013

Brian Luther, 2015

Brian Luther, 2015

Brian Luther, 2015

Brian Luther, 2015

Robert L. Carr, 2012

Robert L. Carr, 2012

Robert L. Carr, 2012

Robert L. Carr, 2012

Robert L. Carr , 2014

Robert L. Carr , 2014

Brian Luther, 2016

Robert L. Carr, 2015

Robert L. Carr, 2015

Robert L. Carr, 2015

Ron Bockelman, 2015

Ron Bockelman, 2015

Ron Bockelman, 2015
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