Rubus discolor Weihe & Nees
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.
Species Description - Stems coarse, scrambling to several m, armed with strong, flattened, curved prickles; primocanes canescent toward the tip; lvs tardily deciduous, grayish- tomentose beneath, bright green and ± glabrous above, those of the primocanes mostly 5-foliolate; lfls broadly ovate to oblong-obovate, usually abruptly short-acuminate, 6–12 cm, sharply toothed; infl cymose-paniculate, often thyrsoid, with strong, flat prickles to 1 cm; cal canescent-tomentose, its unarmed lobes without long appendages; pet white to sometimes pinkish; fr subglobose to slightly elongate, 1.5 cm thick; 2n=28. European sp., occasionally escaped from cult. in the s. part of our range. June–Aug. (R. procerus)