Rubus × 'US 1410' is a foundational semi-erect blackberry selection developed by the USDA breeding program to bridge the gap between European thornless mutations and robust American brambles. It was created by crossing the English cultivar 'Merton Thornless' with the American cultivar 'Brainerd'. 'Merton Thornless' was the critical donor of the thornless trait, a recessive genetic mutation that produces smooth-caned plants, while 'Brainerd'—itself a complex hybrid of the wild Himalayan blackberry—contributed extreme vigor, heat tolerance, and a prolific fruiting habit. This hybridization was essential because early thornless European varieties often lacked the resilience and fruit quality required for North American agriculture.

The selection produces large, deep-black berries with a notably tart flavor profile, characteristic of its 'Brainerd' heritage. While it was primarily used as a breeding parent rather than a widespread commercial variety, its genetic influence is pervasive in modern thornless cultivars.