Rubus ursinus

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Rubus ursinus
Rubus ursinus 10689.JPG
Scientific classification
Kingdom: Plantae
(unranked): Angiosperms
(unranked): Eudicots
(unranked): Rosids
Order: Rosales
Family: Rosaceae
Genus: Rubus
Subgenus: Rubus
Species: R. ursinus
Binomial name
Rubus ursinus
Cham. & Schldl. 1827 not Torr. & Gray 1840 nor (Weeber ex Sudre & Sabr.) Podp. & Domin 1928[1]
Synonyms[2][1]
  • Rubus macropetalus Douglas ex Hook.
  • Rubus vitifolius Cham. & Schltdl.
  • Parmena menziesii (Hook.) Greene
  • Rubus menziesii Hook.
  • Rubus ursinus var. glabratus C.Presl
  • Rubus ursinus var. menziesii (Hook.) Focke
  • Rubus vitifolius subsp. ursinus (Cham. & Schltdl.) Abrams
  • Rubus sirbenus L.H.Bailey

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).[3][4]

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.[5]

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 Concow tribe calls this plant wân-kö-mil′-ē (Konkow language).[6]

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