Rhizome terete, more than 10 cm, ca. 1 cm in diam. Stem 70--100 cm tall, below inflorescence few branched, sparsely retrorse pubescent. Basal leaves ca. 3, and proximal cauline leaves long petiolate; petiole 28--50 cm, nearly glabrous; leaf blade reniform-pentagonal, 7--12 × 10--20 cm, base cordate, 3-parted; central lobe cuneate-rhombic or rhombic; lateral lobes obliquely flabellate, unequally 2-or 3-fid, both surfaces sparsely appressed pubescent, abaxially usually glabrous. Inflorescence 10--30 cm, 7--20-flowered; rachis and pedicels densely retrorse pubescent; basal bracts 3-fid, others linear, 4--7.5 mm. Pedicels 0.8--2.5 cm, with 2 bracteoles above base; bracteoles linear-subulate, 1.5--2.5 mm. Sepals yellow or yellowish, abaxially pubescent; lower sepals ca. 0.9 cm; lateral sepals ca. 0.8 cm; upper sepal subcylindric, 1.5--1.9 cm high, 3.5--6 mm in diam., shortly beaked, lower margin suberect, 0.8--1 cm. Petals glabrous; lip linear, ca. 3 mm; spur circinate, longer than lip. Stamens glabrous; filaments entire. Carpels 3; ovary glabrous. Fl. Jul.
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