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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E-Flora BC Static Map

Distribution of Rubus ursinus subsp. macropetalus
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Species Information

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.

SourceThe Illustrated Flora of British Columbia


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Habitat and 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.

SourceThe Illustrated Flora of British Columbia


Synonyms and Alternate Names:
Rubus macropetalus Douglas ex Hook.
Rubus ursinus var. macropetalus (Douglas ex Hook.) S.W. Br.