Protologue Description: D. INCISA n. sp. Rootstock interrupted by the union of 4 to 11 or more distinctly fusiform annual segments 1 to 3.5 rarely 6 cm. long, slightly tubercled in the axils of distinct teeth, commonly on or near the surface and propagating by late-appearing branches; remains of earlier stems and leaf-stalks occasional, from obscure to 5 mm. long. Stems 2 to 4 dm. high, glabrous, simple, stout. Leaves ternate, glabrous, those of the stem 2, opposite or nearly so, rarely 3 and alternate, on petioles 1 to 4 cm. long; basal; usually present, on petioles 1.2 to 2 dm. long. Leaflets sessile or slightly united at the base, rather sparingly and minutely serrulate to ciliolate-serrulate, unequally, coarsely, and more or less deeply incised-dentate, the teeth, from subacute to rounded and acutely mucronate: of the stem-leaves 4 to 9 cm. long, 1 to 3.5 cm. wide, narrowly lanceolate to lancelate , the central one a little longer than the strongly inequalateral and commonly more deeply incised lateral ones: those of the base and detached rootstocks commonly 1.5 to 2 times wider than accompanying stem-leaflets, 5 to 10 cm. long, 1.5 to 6 cm. wide, more deeply incised or lobate, short-petiolate. Flowers averaging 9 (5-13), white, drying nearly so or more or less purple-tinted; petals 15 to 20 mm. long, 5 to 8 mm. wide, obovate, rounded at the apex, fully 2.5 the length of sepals. Pedicels 1 to 3 cm. long. Style soon 6 to 8 mm. long. Pods not seen. - Sherman, on rich damp slightly open to thickly wooded hillside, 2-15 m. above the housatonic River, 125-129 m. alt., 19 April, 1903, Austin & Eames, no. 3820; 3 May, 1903, Austin, no. 3820 a; 10 May, 1903, Austin & Eames, no. 3820 b; 16 June, 1903, Austin no. 3820 c. (Type material in the author’s herbarium, also in herb. Gray.)