Vascular Plants - Ericaceae - Rhododendron:
Rhododendron albiflorum
white rhododendron, Cascade azalea 
Blooms: June - August
Habit: shrub
Duration: perennial
Origin: Native
Distribution: British Columbia to Oregon, east to Montana
Habitat: Moist, usually forested, slopes, mid- to high elevations in the mountains
Species Description:

General: Deciduous shrubs 1-2 m. tall, the young twigs finely puberulent and covered with stiff, aligned reddish hairs, this same hairiness present on young leaves, bracts and calyx.
Leaves: Leaves thin, deep, clear green on the upper surface, lighter beneath, elliptic-oblanceolate, nearly entire, frequently clustered toward the branch tips, 4-9 cm. long on petioles 5-10 mm. long.
Flowers: Flowers in axillary clusters of 1-4 along the stems, white to ochroleucous; pedicels 1-1.5 cm. long, glandular pubescent and covered with coarse, stiff reddish hairs; sepals 5, distinct, leaf-like, pubescent with coarse, gland-tipped hairs and appressed, eglandular, reddish hairs; corolla united, 1.5-2 cm. broad, 5-lobed about the length, the lobes spreading, nearly equal, entire; stamens 10, exerted, the filaments densely hairy on the lower half; ovary superior, long-hairy.
Fruits: Capsule 5-celled, pubescent, short.
Accepted Name:
Rhododendron albiflorum Hook.
Synonyms:
Azaleastrum albiflorum (Hooker) Rydberg
Rhododendron albiflorum Hook. var. warrenii (A. Nelson) M. A. Lane

Treated in Flora of the PNW as:
Rhododendron albiflorum
Additional Resources:

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

WTU Herbarium Specimens: View list of Rhododendron albiflorum specimens in the WTU Herbarium database.

Washington Flora Checklist: Rhododendron albiflorum treatment.

E-Flora BC: Rhododendron albiflorum atlas page.

CalPhotos: Rhododendron albiflorum images.

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

Ben Legler, 2004

Ben Legler, 2004

Jim Riley

Clayton J. Antieau, 2004

Clayton J. Antieau, 2004

Dana Visalli

H. Tim Gladwin, 1983

H. Tim Gladwin, 1985

H. Tim Gladwin, 1987

H. Tim Gladwin, 1983

Bud Kovalchik

Bud Kovalchik

Bud Kovalchik

Tim Hagan, 2004

Rod Gilbert, 2006

Paul Slichter, 2008

Paul Slichter, 2008

Craig Althen, 2011

Craig Althen, 2011

Susan McDougall, 2004

Susan McDougall, 2013

Ernie Buchanan, 2004

Ernie Buchanan, 2004

Ernie Buchanan, 2004

Ernie Buchanan, 2004

Chris Wood, 2014

Don Jacobson, 2014

Susan McDougall, 2014

Susan McDougall, 2014

Robert L. Carr, 2011

Robert L. Carr, 2011

Robert L. Carr, 2011

Robert L. Carr, 2011

Robert L. Carr, 2011

Robert L. Carr, 2011

G. D. Carr, 2015

G. D. Carr, 2015

G. D. Carr, 2015

G. D. Carr, 2015

G. D. Carr, 2015

G. D. Carr, 2015

Craig Althen, 2016

Craig Althen, 2016

Don Jacobson, 2016
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Washington Native Plant Society
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