Rhizome terete, to 10 cm, ca. 1 cm in diam. Stem 50--100 cm tall, sparsely pubescent with flexuous hairs. Basal leaves withered at anthesis. Proximal cauline leaves long petiolate, petiole 15--30 cm; leaf blade reniform, 14--20 × 14--23 cm, both surfaces sparsely shortly strigose, (5--)7--9-lobed to 2--4 cm from base; central lobe obovate-rhombic; lateral lobes obliquely flabellate, unequally 2-or 3-fid. Inflorescence 14--16(--30) cm, 14--45-flowered; rachis and pedicels densely retrorse pubescent; basal bracts 3-lobed, others linear, smaller, 3.5--5 mm, unlobed. Proximal pedicels 1--1.5 cm, with 2 bracteoles at base of pedicels, bracteoles linear, 5--8 mm. Sepals dull yellow, sparsely retrorse pubescent; lower sepals 0.6--0.9 cm; lateral sepals 0.8--0.9 cm; upper sepal cylindric, 1.3--2.2 cm high, 8--10 mm in diam., apex rounded, with a beak, lower margin 0.9--1.2 cm. Petals glabrous; lip linear, conspicuous; spur slightly incurved, usually slightly longer than lip. Stamens glabrous; filaments entire. Carpels 3, glabrous or spreading pubescent. Fl. Aug--Sep.
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