Caudex unknown. Stem twining, branched, glabrous. Cauline leaves long petiolate; petiole 6--9 cm, glabrous; leaf pentagonal or ovate-pentagonal, 5--5.5 × 7--9 cm, abaxially appressed pubescent, adaxially glabrous, 3-parted; central lobe rhombic; lateral lobes obliquely flabellate, unequally 2-fid. Inflorescence sparsely 2-or 3-flowered; rachis and pedicels glabrous; bracts broadly rhombic, 3-lobed or unlobed. Pedicels 5--14 cm, with 2 bracteoles near middle; bracteoles shortly stipitate or sessile, elliptic or spatulate, 3.5--25 × 1.5--10 cm. Sepals green, abaxially glabrous; lower sepals ca. 1.4 cm; lateral sepals broadly obovate, ca. 1.5 cm; upper sepal high galeate, ca. 2.5 cm high, lower margin oblique upward, suberect, ca. 1.9 cm. Petals ca. 1.8 cm; claw sparsely pubescent; limb glabrous; lip ca. 4.5 cm, slightly concave; spur incurved, ca. 2.5 mm. Stamens glabrous; filaments entire. Carpels 3--5, glabrous. Follicles ca. 1.5 cm. Seeds ca. 3 mm. Fl. Aug--Sep.
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