Caudex unknown. Stem twining, branched, glabrous, or spreading and retrorse pubescent. Middle cauline leaves slightly long petiolate; petiole 3--7 cm, glabrous, base cordate, 3-parted; central lobe rhombic or broadly rhombic, apex shortly acuminate, subpinnately lobed; lateral lobes obliquely flabellate, unequally 2-fid. Inflorescence 15--20 cm, ca. 10-flowered; rachis and pedicels glabrous, or retrorse pubescent; proximal bracts leaflike, distal ones shortly stipitate, oblong. Pedicels 1.6--3.5 cm, with 2 bracteoles near middle; bracteoles shortly stipitate, obovate or spatulate, sometimes elliptic, margin entire, rarely dentate. Sepals green or purple, abaxially glabrous; lower sepals ca. 1.5 cm; lateral sepals ca. 1.6 cm; upper sepal galeate, short, 1.8--2.3 cm high, not clawed, beak slightly upward curved, ca. 1.8 cm from base to beak, lower margin oblique upward, concave. Petals glabrous; claw erect or geniculate at apex, or not geniculate; lip ca. 4 mm, slightly concave; spur circinate, ca. 3 mm, glabrous. Stamens glabrous; filaments entire. Carpels 5, glabrous. Fl. Aug.
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