Vascular Plants - Ericaceae - Rhododendron:
Rhododendron macrophyllum
Page Authors: Don Knoke, David Giblin
Pacific rhododendron, California rhododendron 
Blooms: May-July
Habit: shrub
Duration: perennial
Origin: Native
Conservation Status: Abundant; of no concern.

Distribution: Occurring west of the Cascades crest in Washington; British Columbia south to California.
Habitat: Moist woods, sea level to moderate elevations in the mountains.
Species Description:

General: Evergreen shrubs 1-5 m. tall, the branches puberulent when young, becoming glabrate.
Leaves: Leaves alternate, leathery, glabrous, entire, oblong-elliptic, 8-20 cm. long.
Flowers: Flowers many in terminal, somewhat flat-topped inflorescences; pedicels glabrous; calyx minute; corolla united, narrowly bell-shaped, 2.5-4 cm. long, pale pink to deep rose-purplish, deeply 5-lobed, the lobes spreading, wavy; stamens 10, unequal, the longer ones exerted, filaments sparsely short-hairy on the lower half; ovary superior, hairy.
Fruits: Capsule 4- or 5-celled, short, with heavy walls
Accepted Name:
Rhododendron macrophyllum D. Don ex G. Don
Synonyms:
Rhododendron californicum Hook.

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

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

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

Washington Flora Checklist: Rhododendron macrophyllum treatment.

E-Flora BC: Rhododendron macrophyllum atlas page.

CalPhotos: Rhododendron macrophyllum images.

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

Clayton J. Antieau, 1983

Clayton J. Antieau, 1995

Jim Riley

Dana Visalli

H. Tim Gladwin, 1965

H. Tim Gladwin, 1987

H. Tim Gladwin, 1965

H. Tim Gladwin, 1987

H. Tim Gladwin, 1987

H. Tim Gladwin, 1983

G. D. Carr, 2007

G. D. Carr, 2007

G. D. Carr, 2007

G. D. Carr, 2007

G. D. Carr, 2007

G. D. Carr, 2007

Douglas Houck, 2009

Douglas Houck, 2009

Douglas Houck, 2009

Douglas Houck, 2009

Douglas Houck, 2009

Rod Gilbert, 2006

Rod Gilbert, 2007

Brian Luther, 2015

Brian Luther, 2015

Brian Luther, 2015

Brian Luther, 2015

Brian Luther, 2015

Brian Luther, 2015

Brian Luther, 2015

Brian Luther, 2016
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Washington Native Plant Society
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