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Perennial, with slender trailing stems and erect flowering branches; stems somewhat woody, trailing, stolon-like, to 2 m long, often rooting at the nodes, fine-hairy and armed with short recurved prickles.
Alternate, deciduous, long-stalked, simple (rarely divided into 3 leaflets), the blades egg-heart-shaped, 3-6 cm long, sometimes 3-lobed, double-saw-toothed, green on both surfaces, smooth to sparsely hairy above and below, the leaf-stalks and veins beneath prickly; stipules membranous, narrowly egg-shaped.
Inflorescence of 1 (or 2) long-stalked flowers in leaf axils, the stalks not glandular; corollas pink to purple, the petals 5, lance-elliptic, 6-10 mm long, erect; calyces soft-hairy and sometimes bristly, 5-lobed, the lobes lance-egg-shaped, 6-9 mm long, bent back; ovaries superior; stamens about 15, the filaments slender, not flattened.
Drupelets, minutely hairy, few to several in a red hemispheric cluster like a rudimentary raspberry, the berries about 0.5 cm wide.
Source: The Illustrated Flora of British Columbia