Rubus parviflora, thimbleberry

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Intermountain Flora
Erect unarmed shrub 0.5-2 (3) m tall, the bark gray, flaky; herbage glandular-pubescent, the leaf lamina often glabrous; leaves simple, petiolate, the stipules lanceolate, membranous, the petiole 2-11 cm long, the blade (of the principal leaves) 10-18 (25) cm long and about as wide, palmately (3) 5 (7)-lobed, cordate, irregularly serrate, the lobes obtuse or acute, the veins impressed above, prominent beneath; raceme (1) 2-4 (7)-flowered, terminating the branches; flowers with 5 (6 or 7) sepals and petals; sepals ovate-caudate, 10-18 mm long, glandular-pubescent and villous, sometimes lanate on the margins at the base of the tail; petals (ob)ovate, 8-20 mm long, white, sometimes pinkish-tinged; stamens numerous, the anthers 0.8-1.1 mm long; pistilsnumerous, the ovary pubescent, the style glabrous, 1-1.5 mm long, clavate; aggregate fruit (of coherent druplets) thimble-shaped, separating from the dry receptacle at maturity; 2n = 14.

Cronquist, A., Holmgren, N.H., and Holmgren, P.K. (1997) "Intermountain Flora" pg. 144, vol. 3 part A, The New York Botanical Garden New York.