Vascular Plants - Rosaceae - Rosa:
Rosa pisocarpa
Page Author: David Giblin
clustered rose 
Blooms: May-July
Habit: shrub
Duration: perennial
Origin: Native
Conservation Status: Abundant; of no concern.

Distribution: Occurring west of the Cascades crest in Washington; southern British Columbia to California.
Habitat: Thickets, stream banks, and swampy places at lower elevations.
Species Description:

General: Deciduous shrub 1-2 m. tall, prickly to nearly unarmed, the prickles straight, the stem not bristly.
Leaves: Leaves alternate, pinnate, puberulent on the lower surface, not glandular; leaflets 5-9, elliptic to ovate, 1.5-4 cm. long and 0.7-2 cm. wide, finely serrate.
Flowers: Flowers small, in flat-topped cymes terminating the branches of the season, seldom solitary; calyx lobes 5, 1-1.5 cm. long and 2.5-3.5 mm. wide at the base, constricted in the middle, with coarse, stalked glands on the back; the calyx tube glabrous and bluish-glaucous, 3-5 mm. thick; petals 5, 1.2-2 cm. long, pink; stamens and pistils numerous.
Fruits: Hips purplish, globose or ellipsoid, 6-12 mm. long and thick, the achenes numerous, 3 mm. long, stiffly long-hairy along one side.
Accepted Name:
Rosa pisocarpa Gray
Synonyms:
Rosa anacantha Greene
Rosa pisocarpa Gray var. rivalis (Eastw.) Jepson
Rosa pringlei Rydb.
Rosa rivalis Eastw

Treated in Flora of the PNW as:
Rosa pisocarpa
Additional Resources:

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

WTU Herbarium Specimens: View list of Rosa pisocarpa specimens in the WTU Herbarium database.

Washington Flora Checklist: Rosa pisocarpa treatment.

E-Flora BC: Rosa pisocarpa atlas page.

CalPhotos: Rosa pisocarpa images.

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

Ben Legler, 2006

Ben Legler, 2006

Ben Legler, 2006

Ben Legler, 2006

Ben Legler, 2006

Ben Legler, 2006

Janis Burger

Riley, 1995

G. D. Carr, 2008

G. D. Carr, 2008

G. D. Carr, 2008

G. D. Carr, 2008

G. D. Carr, 2008

G. D. Carr, 2008

G. D. Carr, 2008

Paul Slichter, 2005

Paul Slichter, 2005

Regina Johnson, 2011

Susan McDougall, 2015

Susan McDougall, 2015
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Washington Native Plant Society
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