Vascular Plants - Rosaceae - Spiraea:
Spiraea densiflora
Page Author: David Giblin
subalpine spirea, rose meadowsweet 
Blooms: June-August
Habit: shrub
Duration: perennial
Origin: Native
Conservation Status: Abundant; of no concern.

Distribution: Chiefly in the Cascades and Olympic Mountains of Washington; British Columbia south to California and Nevada, east to Montana and Wyoming.
Habitat: Moist forest openings and rocky slopes, mid- to high elevations in the mountains.
Species Description:

General: Low, spreading, deciduous, freely-branched shrub from strong rhizomes, 5-10 dm. tall, with reddish-brown bark.
Leaves: Leaf blades ovate-oval, bright green above, paler and strongly veined beneath, 2-4 cm. long, finely serrate half their length.
Flowers: Inflorescence a dense, flat-topped panicle, 2-4 cm. broad; calyx hemispheric, 1-1.5 mm. wide, the 5 lobes triangular, 1 mm. long, erect to spreading; petals oval, bright pink to rose, 1.5-2 mm. long; stamens 25-50, the filaments pink, exceeding the petals.
Fruit: Follicles 4-5, leathery, glabrous, 2.5-3 mm. long.
Subspecies & Varieties:
Accepted Name:
Spiraea densiflora Nutt. ex Greenm.
Synonyms:
(none)

Treated in Flora of the PNW as:
Spiraea densiflora
Additional Resources:

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

WTU Herbarium Specimens: View list of Spiraea densiflora specimens in the WTU Herbarium database.

Washington Flora Checklist: Spiraea densiflora treatment.

E-Flora BC: Spiraea densiflora atlas page.

CalPhotos: Spiraea densiflora images.

USDA Plants Database: Spiraea densiflora.
Additional photographs of Spiraea densiflora:
(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

Ben Legler, 2004

Ben Legler, 2004

Ben Legler, 2004

Ben Legler, 2004

Jim Riley

H. Tim Gladwin, 1982

H. Tim Gladwin, 1986

H. Tim Gladwin, 1982

H. Tim Gladwin, 1986

Bud Kovalchik

Bud Kovalchik

Bud Kovalchik

Bud Kovalchik

Jim Riley

Tim Hagan, 2004

G. D. Carr, 2008

G. D. Carr, 2008

G. D. Carr, 2008

G. D. Carr, 2008

Douglas Houck, 2009

Douglas Houck, 2009

Douglas Houck, 2009

Paul Slichter, 2008

Susan McDougall, 2004

Susan McDougall, 2004

Douglas Houck, 2012

Douglas Houck, 2012

Douglas Houck, 2012

Susan McDougall, 2013

Susan McDougall, 2008

Susan McDougall, 2013

Gary Brill, 2014

Gary Brill, 2014

Susan McDougall, 2014

Susan McDougall, 2013

Susan McDougall, 2014

Robert L. Carr , 2014

Robert L. Carr , 2014

G. D. Carr, 2015

Don Jacobson, 2016
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Washington Native Plant Society
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