UW Burke Herbarium species comparison

Leaves alternate, partially evergreen, 3- to 5-foliate;

stipules lanceolate, 5-10 mm. long;

leaflets ovate to rotund-ovate, acuminate, 5-10 cm. long, doubly serrate, green and glabrous above, paler and pubescent beneath.

Flowers numerous in flat-topped panicles, hairy and stipitate-glandular;

calyx white-woolly, the 5 lobes reflexed, lanceolate, acuminate, up to 1 cm. long;

petals 5, white, pinkish tinged, 10-15 mm. long;

stamens at least 75;

pistils numerous, styles glabrous.

Drupelets coherent, and with the receptacle forming a globular blackberry about 1.5 cm. thick.