Caudex carrot-shaped, 4.2--5.5 cm, 7--9 mm in diam. Stem twining, branched, retrorse or spreading pubescent or apically glabrous. Middle cauline leaves long petiolate; petiole ca. 4.6 cm, sparsely spreading pubescent; leaf blade pentagonal or suborbicular, 5--11 × 8--14 cm, abaxially glabrous, adaxially sparsely appressed pubescent at veins, base cordate, 3--5-parted; central lobe rhombic, apex acuminate, pinnately lobed; lateral lobes obliquely flabellate, unequally 2-parted. Inflorescence 4--8-flowered; rachis and pedicels glabrous; bracts leaflike. Pedicels 3--4.5 cm, proximally with 2 bracteoles; bracteoles narrowly oblong to linear-subulate, 4--7 × 0.5--1.2 mm, glabrous. Sepals purple, abaxially glabrous; lower sepals ca. 1.4 cm; lateral sepals ca. 1.5 cm; upper sepal galeate, 1.8--2 cm, lower margin ca. 1.6 cm. Petals ca. 1.8 cm, glabrous; claw geniculate at upper part; lip ca. 4 mm, slightly concave; spur incurved, ca. 2 mm, subglobose. Stamens glabrous; filaments entire. Carpels 5, glabrous. Fl. Aug.
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