Another double-flowered thimbleberry was found about 1975 by Bob Hornback on Starrett Hill, Monte Rio, California and given the cultivar name 'Dr.
Rubus | Rubus idaeus | Rubus ursinus | Rubus ulmifolius | ''Rubus ursinus'' (''R. vitifolius'') | Rubus armeniacus | red raspberry (''Rubus idaeus'') | Rubus phoenicolasius | Rubus parviflorus | Rubus leucodermis | Rubus laciniatus | Rubus coreanus | Rubus chamaemorus |
Associated plants include Alnus rubra, Filipendula occidentalis, Rubus parviflorus, Rubus spectabilis, Saxifraga occidentalis, Saxifraga nuttallii, Saxifraga mertensiana, and Mimulus guttatus, though it often grows on slopes with few other plants around.
Mild sweeteners such as fireweed (Epilobium angustifolium), camas bulb (Camassia quamash) or sweet berries such as salal berries (Gaultheria shallon), or thimbleberries (Rubus parviflorus) are occasionally added.