PlantFiles: Allegheny Blackberry, Highbush Blackberry
Rubus allegheniensis

Beside trailing blackberry, this may be the only other blackberry species to be hardy to Minnesota. It is rated at zone 4 hardy but many cultivars are made only for zone 5 - I have seen a few zone 4 cultivars online but hadn't purchased them - the only area I have seen them growing in the wild so far (they can be a bit difficult to tell from raspberries) is the St. Croix valley at O' Brien State Park. It prefers acidic soil, which explains its absent from most of Minnesota - the northern part of the the state is mostly acidic soil but too cold for it to grow while the southern part is mostly alkaline - hositle environment toward it. Maybe the St. Croix River brings acidic soil from further north making it more friendly toward highbush raspberry. It is also possibly zone 3b hardy but I will have to research further. It is introduced and spread in the wild in California and British Columbia. Minnesota is its western most range - generally limited by the Eastern Forest.