This northeastern species is known from adjacent regions of Ill. Ind., Ohio, W.Va. and Va. (K). There are several reports from Ky. (M), but only one coll. is known: ROWA (MDKY), E.P. Walters, 20 Aug 1938, edge of woods, Fraley's Hollow, Morehead. D. canadense has been considered close to cuspidatum (B.C. Shubert in F), but it also resembles the paniculatum group (Isely 1990; W). Like cuspidatum, canadense has relatively long stipules, large primary bracts, large flowers, and short-stipitate to sessile loments. It differs in its shorter petioles (mostly 1-6 cm versus 4-10 cm) and petiolules (1-3 mm versus 3-5 mm), more deciduous, smaller stipules (4.5-9.5 mm long versus 11-20 mm) and stipels (2-4 mm versus 5-9 mm), leaflets thicker, with conspicuous venation and narrower shape (oblong to ovate-lanceolate versus ovate-acuminate), and loment segments curved on both sides (versus angled).