Caudex unknown. Stem twining, branched, sparsely retrorse pubescent or nearly glabrous. Middle cauline leaves long petiolate; petiole 7.5--10 cm, sparsely pubescent; leaf blade cordate-pentagonal, 7--9.5 × 12--14 cm, abaxially sparsely pubescent at veins, adaxially sparsely strigose, 3-parted; central lobe broadly rhombic, 3-fid at middle; lateral lobes obliquely flabellate, unequally 2-parted. Inflorescence to 9 cm, 3--10-flowered; rachis and pedicels glabrous; basal bracts leaflike, others narrowly linear, ca. 4 mm. Pedicels decurved, to 3.8 cm, with 2 bracteoles at middle or below; bracteoles narrowly linear or subulate, 3--4 mm. Sepals blue-violet, abaxially glabrous; lower sepals 1--1.5 cm; lateral sepals 1.1--1.6 cm; upper sepal galeate, 1.8--2.2 cm, shortly beaked, lower margin concave. Petals ca. 1.8 cm, glabrous; limb ca. 1 cm; lip ca. 5 mm, 2-lobed at apex; spur circinate, ca. 3.5 mm. Stamens glabrous; filaments entire. Carpels 5(--10), glabrous. Follicles erect, 1--2.4 cm; persistent style ca. 2.5 mm. Seeds ca. 3 mm. Fl. Sep.
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