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.
Flowers: May-July
Origin: Native
Growth Duration: Perennial
Conservation Status: Not of concern
Evergreen shrubs 1-5 m. tall, the branches puberulent when young, becoming glabrate.
Leaves alternate, leathery, glabrous, entire, oblong-elliptic, 8-20 cm. long.
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.
Capsule 4- or 5-celled, short, with heavy walls
PNW Herbaria: Specimen records of Rhododendron macrophyllum in the Consortium of Pacific Northwest Herbaria database.
WA Flora Checklist: Rhododendron macrophyllum checklist entry.
OregonFlora: Rhododendron macrophyllum information.
E-Flora BC: Rhododendron macrophyllum atlas page.
CalPhotos: Rhododendron macrophyllum photos.
USDA Plants: Rhododendron macrophyllum information.