Caudex terete, 1.5--3 cm. Stem twining, 1.5--2.5 m tall, apically pubescent; bulbils usually axillary, dark purple, to 6 mm, deciduous. Leaves long petiolate; petiole 8--18 cm; leaf blade cordate-pentagonal, 5.5--9 × 6--9 cm, both surfaces glabrous, 3-parted; central lobe rhombic-ovate, apex long acuminate; lateral lobes obliquely flabellate, unequally 2-fid slightly beyond middle. Inflorescence 1--6-flowered; bracts leaflike; rachis and pedicels retrorse and appressed pubescent. Pedicels 1.5--4.5 cm, with 2 bracteoles at middle; bracteoles leaflike. Sepals blue, abaxially glabrous or nearly so, adaxially white pubescent; lower sepals ca. 1.8 cm; lateral sepals 1.8--2 cm; upper sepal high galeate, 2.5--3 cm high, lower margin oblique upward, slightly concave, 1.5--1.8 cm. Petals glabrous; lip 6--7 mm, 2-lobed at apex; spur incurved, circinate, ca. 1 cm, apex subglobose. Stamens glabrous; filaments 2-denticulate or entire. Carpels 5, glabrous. Fl. Sep.
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