Caudex unknown. Stem twining, branched, sparsely retrorse pubescent. Middle cauline leaves long or shortly petiolate; petiole 2.4--8 cm; leaf blade cordate-pentagonal, 4.5--12 × 6--13 cm, both surfaces sparsely appressed pubescent, 3-parted; central lobe ovate-narrowly rhombic; lateral lobes obliquely flabellate, unequally 2-parted. Inflorescence (1-or)2--4-flowered; rachis and pedicels retrorse pubescent; bracts leaflike. Pedicels 2--4 cm, with 2 bracteoles at middle; bracteoles subulate, ca. 4 mm, sometimes bracteoles below inflorescence narrowly ovate, 3-fid or unlobed. Sepals black-purple, abaxially sparsely pubescent or nearly glabrous; lower sepals ca. 1.4 cm; lateral sepals ca. 1.5 cm; upper sepal high galeate, 1.8--2 cm high, not clawed, 1.4--1.8 cm from base to beak, lower margin concave, oblique upward. Petals glabrous; lip narrow, ca. 6 mm; spur circinate, ca. 4 mm. Stamens glabrous; filaments 2-denticulate or entire. Carpels 5, glabrous. Fl. Aug.
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