Stout, sprawling to arching bramble. Stems 5-angled, with strong recurved thorns. Leaves evergreen, divided palmately, 3–5 leaflets. Leaflets deeply lobed with each lobe sharply toothed and pointed, underside hairy and green. Flowers more than 1 in., often more than 10 per cluster. Petals 5, oval, pink or white. Blackberries oval, black, shiny, delicious. Weedy and invasive in moist disturbed places at low to mid-elevations. Compare to R. discolor, a more common invasive nonnative blackberry, with undivided leaflets.
- Rarity: Common
- Flowering Time: Late Spring, Early Summer
- Life Cycle: Perennial
- Height: to 30 feet
- Habitat: Coastal, Meadow, Disturbed
- Found In: Olympic Np, Mt. Rainier Np, Siskiyous, N Cascades Np
- Native: No