California Blackberry

Rubus macropetalus Dough; Hook. Fl. Bor. Am. 1: 178. 1832
ubus myriacanthus Dougl.; Hook. Fl. Bor. Am. 1: 178, as synonym. 1832.
Stem biennial, terete, often purplish, climbing or decumbent, sparingly hirsute or glabrous the second year, armed with small, slightly retrorse prickles; leaves of the floral branches ternate; stipules linear-subulate, 1-1.5 cm. long, hirsute; petioles, petiolules, and midveins sparingly and weakly prickly; petioles 4-5 cm. long; terminal leaflet broadly ovate or subcordate, often more or less lobed, double-serrate, with ovate or lanceolate-mucronate teeth, acute or acuminate, green and sparingly hirsute on both sides, sometimes glabra te in age, 5-8 cm. long; petiolules 1-2 cm. long; lateral leaflets ovate, subsessile, 3-5 cm. long; inflorescence corymbose, terminal or in the upper axils, hirsute or villous, armed with weak prickles 461
and slightly glandular; hypanthium and calyx villous-tomentose, usually prickly; sepals lanceolate, with long caudate acuminations ; petals of the staminate flowers 12-16 mm. long, elliptic, white; those of the essentially pistillate flowers oval, 7-10 mm. long; fruit hemispheric or slightly elongate, black, sweet, 10-12 mm, long, 8-10 mm. thick; drupelets many, glabrous; putamen strongly reticulate.
Type locality : Banks of rivers and in low woods, in the valley of the Columbia. Distribution: British Columbia to Idaho and northern California.