Rubus parviflorus (Thimbleberry)'s a species of Rubus, native to western and northern North America, from Alaska east to Ontario and Michigan, and south to northern Mexico. It grows from sea level in the north, up to 2,500 m altitude in the south of the range. It's a dense shrub up to 2.5 m tall with canes 3-15 mm diameter, often growing in large clumps which spread through the plant's underground rhizome. Unlike most other members of the genus, it's no thorns. The leaves are palmate, 5-20 cm a… (More on Thimbleberry)