Caudex ellipsoid-globose or subterete, 1.5--3.5 cm. Stem 85--110 cm, simple or 1-branched below inflorescence, glabrous or nearly so, near inflorescence retrorse pubescent. Proximal cauline leaves long petiolate; petiole 20--25 cm, distal ones shorter, base sheathed; leaf blade reniform or pentagonal, 3.8--6 × 6.5--11 cm, both surfaces glabrous, 3-parted; central lobe obovate, obtrapezoid or rhombic; lateral lobes flabellate, unequally 2-fid near middle. Inflorescence 20--50 cm, 15--30-flowered; rachis and pedicels ± densely retrorse pubescent; lowermost bracts 3-fid, others linear. Pedicels 0.5--2.5(--5.8) cm, with 2 bracteoles proximally to distally; bracteoles narrowly linear, 1.6--4 mm. Sepals brown-purple or gray-purple, ca. 1 cm, sparsely pubescent or nearly glabrous. Petaline limb rounded at apex, ecalcarate; lip ca. 2.5 mm. Stamens glabrous; filaments entire. Carpels 3, sparsely pubescent or glabrous. Follicles 1.2--2 cm, glabrous. Seeds obovate, ca. 2.6 mm. Fl. Aug--Sep. 2n = 16*.
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