Rubus ferrofluvius

Rubus ferrofluvius is a North American species of dewberry in Section Procumbentes of the genus Rubus, a member of the rose family. The specific epithet ferrofluvius refers to its type locality in Iron River, Wisconsin, so it may be called Iron River dewberry. It occurs in sandy regions of Minnesota and Wisconsin.

Rubus ferrofluvius inhabits remnant prairies, savannas, meadows, and open woods dominated by oaks (Quercus), quaking aspen (Populus tremuloides) or pines (Pinus), as well as anthropogenic habitats such as abandoned fields and roadsides. Like many other native brambles, specifically members of Sections Setosi, Hispidi, and Procumbentes, it prefers or may be confined to transitional habitats with access to a shallow water table. These situations are often sandy, acidic, and dry at the surface, sometimes extending down into sedge-dominated habitats with moist, peaty soil. Some populations are known to occur on shorelines composed of bedrock or sand in far northern Minnesota, as well as dry-mesic loamy soils in the Twin Cities metropolitan area.