E-Flora BC: Electronic Atlas of the Flora of British Columbia

Rubus ursinus subsp. macropetalus Cham. & Schltdl. (Douglas ex Hook.) Roy L. Taylor & MacBryde
trailing blackberry (California blackberry)
Rosaceae (Rose family)

Introduction to Vascular Plants
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Distribution of Rubus ursinus subsp. macropetalus
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Species Information

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Trailing shrub, 2-5 m or more long; stems barely woody, 2-10 mm in diameter, arching, sprawling and trailing along the ground, some rooting at the tip, with slender, straight to slightly recurved prickles, somewhat hairy when young becoming smooth and glaucous; flowering branches ascending, to 50 cm tall.
Alternate, deciduous, pinnately compound, 5-15 cm long; leaflets 3 (rarely 5), narrowly to broadly egg-shaped, 3-10 cm long, coarsely double-saw-toothed, green and smooth or nearly so on both surfaces, the terminal leaflet largest and often deeply 3-lobed to divided, the leaf-stalks and midveins beneath fine-prickly; stipules linear, 8-11 mm long.
Inflorescence of few stalked flowers in small, open, flat-topped terminal clusters, the stalks often purplish stalked-glandular; male and female flowers on separate plants; corollas white, the petals 5, spreading, elliptic and 8-11 mm long in female flowers, lanceolate and 12-17 mm long in male flowers; calyces woolly and usually stalked-glandular, sometimes fine-prickly, 5-lobed, the lobes lanceolate, spreading to bent back, 7-11 mm long; ovaries superior; stamens 75 to 100.
Drupelets, generally smooth, coherent in a black oblong to nearly globe-shaped cluster that falls with the fleshy receptacle (a blackberry), the berries 1-1.5 cm long.

Source: The Illustrated Flora of British Columbia

Habitat / Range

Dry to moist thickets, clearings, waste places and open forests in the lowland to lower montane zones; common in SW BC; S to ID and N CA.

Source: The Illustrated Flora of British Columbia


The climate type for this species, as reported in the: "British Columbia plant species codes and selected attributes. Version 6 Database" (Meidinger et al. 2008), is not evaluated, unknown or variable.

Synonyms and Alternate Names

Rubus macropetalus Douglas ex Hook.
Rubus ursinus var. macropetalus (Douglas ex Hook.) S.W. Br.

Taxonomic and Nomenclatural Links

Additional Photo Sources

General References