Vascular Plants - Hydrangeaceae - Philadelphus:
Philadelphus lewisii
Page Author: David Giblin
Lewis' mock orange 
Blooms: May-July
Habit: shrub
Duration: perennial
Origin: Native
Conservation Status: Abundant; of no concern.

Distribution: Widely distributed throughout Washington; British Columbia south to California, east to Montana.
Habitat: Various habitats, dry to moist, sea level to 7000 feet (on the east slopes of the Cascades).
Species Description:

General: Erect, deciduous shrub 1.5-2.5 m. tall.
Leaves: Leaves opposite, petiolate, ovate to elliptic, usually remotely denticulate or dentate, with marginal hairs, 2.5-7 cm. long and 1-4 cm. wide.
Flowers: 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.
Fruits: Capsule woody, ovate-elliptic, pointed at the ends, 6-10 mm. long, 4 celled.
Accepted Name:
Philadelphus lewisii Pursh
Synonyms:
Philadelphus confusus Piper
Philadelphus trichothecus Hu

Treated in Flora of the PNW as:
Philadelphus lewisii
Additional Resources:

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

WTU Herbarium Specimens: View list of Philadelphus lewisii specimens in the WTU Herbarium database.

Washington Flora Checklist: Philadelphus lewisii treatment.

E-Flora BC: Philadelphus lewisii atlas page.

CalPhotos: Philadelphus lewisii images.

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

Clayton J. Antieau, 1990

Ben Legler, 2004

Ben Legler, 2004

Ben Legler, 2004

Ben Legler, 2004

Ben Legler, 2004

Ben Legler, 2004

Ben Legler, 2004

Clayton J. Antieau, 2004

Clayton J. Antieau, 2004

Clayton J. Antieau, 2004

Jim Riley

Dana Visalli

Dana Visalli

H. Tim Gladwin, 1983

H. Tim Gladwin, 1985

H. Tim Gladwin, 1985

H. Tim Gladwin, 2000

Bud Kovalchik

Ben Legler, 2006

Ben Legler, 2006

Ben Legler, 2006

Ben Legler, 2006

Ben Legler, 2006

Ben Legler, 2006

Ben Legler, 2006

G. D. Carr, 2007

G. D. Carr, 2007

G. D. Carr, 2007

G. D. Carr, 2006

G. D. Carr, 2006

Rod Gilbert

Rod Gilbert

Al Dodson, 2009

Walter Siegmund, 2011

Walter Siegmund, 2011

Tony Peterson, 2011

Harry Thomas, 2011

Susan McDougall, 2004

Ron Bockelman, 2010

Ron Bockelman, 2010

Ron Bockelman, 2011

Ron Bockelman, 2011

Don Jacobson, 2013

G. D. Carr, 2013

G. D. Carr, 2013

Brian Luther, 2015

Susan McDougall, 2015

Brian Luther, 2015
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Washington Native Plant Society
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