Trailing blackberry (Plants of Claremont Canyon Regional Preserve)

Trailing blackberry

Rubus ursinus

Summary ⁷

Rubus ursinus is a species of blackberry or dewberry known by the common names California blackberry, California dewberry, Douglas berry, Pacific blackberry or Pacific dewberry and trailing blackberry. It is native to western North America. This is a wide, spreading shrub or vine-bearing bush with prickly branches that can tip layer to spread vegetatively. Its white flowers may be distinguished from those of other blackberries by their narrow petals. The species is dioeocious, with male and...

Distribution ⁸

Trailing blackberry grows from British Columbia to northern California
and eastward to central Idaho [6,27,36]. It is particularly common from
the Cascades to the Pacific Coast [27]. Trailing blackberry extends
through southern California into Mexico [9,55]. The subspecies
macropetalus occurs from British Columbia and Idaho southward into
northern California [36].