Page authors: Don Knoke, David Giblin
Philadelphus lewisii
Lewis' mock orange

Distribution: Widely distributed on both sides of the Cascades crest in Washington; British Columbia to California, east to Idaho and Montana.

Habitat: Dry to moist, partially shaded to open areas from low to middle elevations in the mountains.

Flowers: May-July

Origin: Native

Growth Duration: Perennial

Conservation Status: Not of concern


Erect, deciduous shrub 1.5-2.5 m. tall.


Leaves opposite, petiolate, ovate to elliptic, usually remotely denticulate or dentate, with marginal hairs, 2.5-7 cm. long and 1-4 cm. wide.


Inflorescence of terminal racemes and solitary flowers in the axils of upper leaves; calyx usually glabrous, bell-shaped, the 4 lobes ovate to ovate-lanceolate, 5-6 mm. long; petals 4, white, oblong, 10-20 mm. long, obtuse or rounded; stamens 25-40, unequal; styles as long as the stamens, fused most of their length, the 4 style branches stigmatic on the inner surface most of their length; ovary mostly inferior.


Capsule woody, ovate-elliptic, pointed at the ends, 6-10 mm. long, 4 celled.

Accepted Name:
Philadelphus lewisii Pursh
Publication: Fl. Amer. Sept. 1: 329 [1813]. 1814.

Synonyms & Misapplications:
Philadelphus confusus Piper
Philadelphus trichothecus S.Y. Hu
Philadelphus zelleri S.Y. Hu
Additional Resources:

PNW Herbaria: Specimen records of Philadelphus lewisii in the Consortium of Pacific Northwest Herbaria database.

WA Flora Checklist: Philadelphus lewisii checklist entry.

E-Flora BC: Philadelphus lewisii atlas page.

CalPhotos: Philadelphus lewisii photos.

USDA Plants: Philadelphus lewisii information.

66 photographs:
Group by