Page author: David Giblin
Spiraea densiflora
WTU specimens
Other herbaria

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.

Flowers: June-August

Conservation Status: Not of concern

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.

Accepted Name:
Spiraea densiflora Nutt. ex Greenm.

Synonyms:
(none provided)
Infraspecies:
var. densiflora    Both sides of the Cascades in Washington; British Columbia south to California; east to Alberta, south to Idaho and Montana.
var. splendens    Both sides of the Cascades in Washington; British Columbia south to California; east to Alberta, south to Idaho and Montana.
Additional Resources:

PNW Herbaria: Specimen records of Spiraea densiflora in the Consortium of Pacific Northwest Herbaria database.

WA Flora Checklist: Spiraea densiflora checklist entry.

E-Flora BC: Spiraea densiflora atlas page.

CalPhotos: Spiraea densiflora photos.

USDA Plants: Spiraea densiflora information.

49 photographs:
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