Rubus Ursinus - Trailing Blackberry

Rubus Ursinus - Trailing Blackberry

Image Credit: Walter Siegmund

Family: Rosaceae

Common names: trailing blackberry, dewberry, California blackberry

General bloom time: April - August

Identification: Perennial plant with prostrate, trailing stems 5 meters or more long.  Male and female flowers are found on separate individuals.  Prickles ar ecurved and unflattened.

Leaves: Compound leaves with 3 leaflets.  Leaves are alternate and deciduous.  Leaflets are 3 - 7 cm long, double-serrated, and dark green.  Terminal leaflet has three deep lobes.

Flowers: Flowering stalks are up to 50 cm long, with several leaves and 1 to several flower clusters.  Flowers have five petals, are up to 4 cm across, and are white or pink.

Fruit: Black berries up to 1 cm long.

Habitat: Open to dense wooded areas, up to mid elevations.  Often found in disturbed sites.

Ecology: Berries eaten by birds, flowers benefit pollinators.

Image Credit: Dawn Endico

Places to find in the Portland Area: Himes Park, Forest Park

Fun Facts: Male and female flowers are found on separate plants. Berries are edible and delicious!


Pojar, J. & A. MacKinnon. 1994. Plants of the Pacific Northwest Coast: Washington, Oregon, British Columbia & Alaska. Vancouver B.C., Lone Pine Publishing.


2006. Rubus ursinus. Burke Museum of Natural History and Culture. University of                               Washington. is external)