Vascular Plants - Sapindaceae - Acer:
Acer glabrum
Page Author: David Giblin
Rocky Mountain maple 
Blooms: April-June
Habit: tree,shrub
Duration: perennial
Origin: Native
Conservation Status: Abundant; of no concern.

Distribution: Widely distributed throughout Washington; Alaska south to California, east to the Rockies and Nebraska.
Habitat: Moist woods from sea level to mid-elevations in the mountains.
Species Description:

General: Shrub or small tree 1-10 m. tall; stems glabrous, the bark grayish to reddish-purple.
Leaves: Leaves opposite, glabrous to sparsely glandular-puberulent, 2-14 cm. long and nearly as broad, cordate, palmately 3-5 lobed, coarsely serrate, paler on the lower surface.
Flowers: Plants monoecious to dioecious, staminate flowers with only rudiments of a pistil, but pistillate flowers with well-developed, though not always fertile, stamens; flowers about 8 mm. broad, in flat-topped clusters in the leaf axils; sepals usually 5; petals equal in size and number, or lacking; stamens usually 10, inserted on the outer edge of a lobed disk; styles and stigmas 2; ovary superior, 2-celled.
Fruits: Samaras 2.5-3 cm. long, the wings not divergent.
Subspecies & Varieties:
Accepted Name:
Acer glabrum Torr.
Synonyms:
(none)

Treated in Flora of the PNW as:
Acer glabrum
Additional Resources:

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

WTU Herbarium Specimens: View list of Acer glabrum specimens in the WTU Herbarium database.

Washington Flora Checklist: Acer glabrum treatment.

E-Flora BC: Acer glabrum atlas page.

CalPhotos: Acer glabrum images.

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

Clayton J. Antieau, 1990

Clayton J. Antieau, 1982

Ben Legler, 2004

Ben Legler, 2004

Clayton J. Antieau, 2004

Clayton J. Antieau, 2001

Clayton J. Antieau, 2001

H. Tim Gladwin, 1989

H. Tim Gladwin, 1989

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

Rod Gilbert , 2005

Clayton J. Antieau, 2008

Clayton J. Antieau, 2008

Robert L. Carr, 2009

Robert L. Carr, 2009

Robert L. Carr, 2009

Robert L. Carr, 2009

G. D. Carr, 2010

G. D. Carr, 2010

G. D. Carr, 2010

G. D. Carr, 2011

G. D. Carr, 2011

Ron Bockelman, 2011

Ron Bockelman, 2011

Ron Bockelman, 2011

Susan McDougall, 2004

Susan McDougall, 2009

Julia Bent, 2010

Julia Bent, 2013

Julia Bent, 2011

Brian Luther, 2015

Susan McDougall, 2014

Brian Luther, 2016

Brian Luther, 2016
(password required)

Burke Museum


©2017 Burke Museum of Natural History and Culture.
All Rights Reserved. Box 353010, University of Washington,
Seattle, WA 98195-3010, Phone: 206-543-5590.
On the UW campus at 17th Avenue NE and NE 45th Street.
Washington Native Plant Society
WA Native Plant Society