Herbs perennial, (35-)50-100(-130) cm tall. Rhizomes 3-8 mm in diam. Stems erect, simple or branched above, glabrous or rarely puberulent. Basal leaves withered by flowering. Cauline leaves (5-)7-10(-15), petiolate, trifolioate, rarely lowermost with 4 or 5 leaflets, often simple below raceme; petiole 1-6(-10) cm, not auriculate at base, wingless or wing rarely to 1 mm wide; petiolules 1-6(-11) mm; leaflets subequal or terminal larger, ovate or lanceolate, rarely elliptic or subrhomboid, (1.5-)3-8(-12) × (1-)2-3(-5) cm, glabrous or with appressed, antrorse, simple trichomes 0.1-0.7 mm, base cuneate or obtuse, that of lateral leaflets often oblique, margin serrate or crenate, rarely lobed or subentire, ciliate with trichomes more than 0.1 mm, teeth mucronate, apex acute, acuminate, or acuminate-caudate. Fruiting pedicels divaricate, 5-9(-13) mm, slender, straight, glabrous or sparsely puberulent. Sepals oblong, 2.5-3.5(-4) × 1.5-2 mm, erect or ascending, not saccate, glabrous. Petals purple, lavender, pink, or rarely white, obovate or obovate-oblong, (6-)7-9(-10) × (2.5-)3-4 mm, rounded at apex; claw 1.5-2(-3) mm. Median filament pairs 4-5 mm, lateral pair 3-4 mm; anthers (0.6-)0.7-1 mm. Pistil glabrous; style slender, ca. 1 mm; stigma entire. Fruit and not seen. Fl. May-Jul.
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