Cham. & Schldl. 1827 not Torr. & Gray 1840 nor (Weeber ex Sudre & Sabr.) Podp. & Domin 1928
Rubus ursinus is a North American species of blackberry or dewberry known by the common names California blackberry, California dewberry, Douglas berry, Pacific blackberry, Pacific dewberry and trailing blackberry. It is native to western Canada, the United States, and Mexico (British Columbia, Washington, Oregon, Idaho, Montana, California, Baja California).
Rubus ursinus is a wide, spreading shrub or vine-bearing bush up to 20 cm (8 inches) tall, with prickly branches that can take if they tough ground, thus enabling the plant to spread vegetatively and form large clonal colonies. Leaves usually have 3 leaflets but sometimes 5 or only 1. Flowers are white with narrower petals than most related species. The plantis dioeocious, with male and female plants on separate plants, also unusual for the genus. As with other Rubus, the canes are typically vegetative the first year, and reproductive in the second. The sweet, very aromatic, edible fruits are dark purple, dark red, or black and up to 2 centimeters (0.8 inches) in length.
They need consistent amounts of moisture to set large fruit. In coastal areas of Washington state they are called "little wild blackberries". Seed size seems to be related to fruit "cell" size, and the smallest (1 cm) fully formed berries are most highly prized.
A selected plant of this species called the 'Aughinbaugh' blackberry was a parent of the loganberry. The species is also an ancestor of the boysenberry, and the marionberry (also called the 'Marion' blackberry). 'Wild Treasure', released by the USDA-ARS in 2010, is a hybrid between a selection of R. ursinus and 'Waldo' (another cultivar that is a second generation descendant of 'Marion' that has no prickles); it has the fruit size and flavor of the wild species, but without prickles, and the fruit are machine harvestable.
- The Plant List, Rubus ursinus
- United States Department of Agriculture GRIN taxonomy
- Biota of North America Program 2014 county distribution map
- Calflora taxon report, University of California, Rubus ursinus Cham. & Schldl., California blackberry, Pacific blackberry
- Flora of North America, Rubus ursinus Chamisso & Schlechtendal, 1827. California or Pacific or creeping blackberry
- Chesnut, Victor King (1902). Plants used by the Indians of Mendocino County, California. Government Printing Office. p. 408. Retrieved 24 August 2012.
|Wikimedia Commons has media related to Rubus ursinus.|
- United States Department of Agriculture Plants Profile for Rubus ursinus
- Jepson Manual Treatment of Rubus ursinus
- Rubus ursinus — Calphotos Photo gallery, University of California
- University of Washington, Burkey Museum herbarium image collection photos, description, Washington distribution map
- Northwest Oregon Wetland Plants Project, Rubus ursinus - Trailing blackberry; Dewberry; Pacific blackberry
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