The flavor originates from Rubus leucodermis, more commonly known as the "Whitebark Raspberry" or "Blue Raspberry" for the blue-black color of its fruit.
Rubus | Rubus idaeus | Rubus ursinus | Rubus ulmifolius | ''Rubus ursinus'' (''R. vitifolius'') | Rubus armeniacus | red raspberry (''Rubus idaeus'') | Ceanothus leucodermis | Rubus phoenicolasius | Rubus parviflorus | Rubus leucodermis | Rubus laciniatus | Rubus coreanus | Rubus chamaemorus |