Rhizome terete, ca. 8 cm, 3--4 mm in diam. Stem twining, ca. 1 m tall, sparsely retrorse pubescent. Proximal cauline leaves long petiolate; petiole to 30 cm, nearly glabrous; leaf blade pentagonal-reniform, 6--10 × 10--18 cm, both surfaces sparsely appressed pubescent; distal leaves smaller above, petioles slightly shorter than or subequaling leaf blade. Inflorescence 8--14 cm, 4--9-flowered; rachis and pedicels densely yellowish retrorse pubescent; bracts leaflike to ovate to linear, 2--5 mm. Pedicels 3.5--8 mm, with 2 bracteoles at middle or near base; bracteoles linear. Sepals white or purplish, abaxially appressed pubescent; lower sepals narrowly elliptic; lateral sepals obovate; upper sepal cylindric, 1.3--1.5 cm high, middle 2.5--3(--5) mm in diam., erect or slightly curved, external margin with a beak, lower margin ca. 1 cm. Petals 1.3--1.5 cm, glabrous; lip linear, conspicuous; spur slightly circinate at apex, subequaling or slightly longer than lip. Stamens glabrous; filaments entire. Carpels 3; ovary sparsely appressed yellowish pubescent. Follicles 0.8--1.1 cm. Seeds ca. 1.5 mm. Fl. Aug--Sep, fr. Oct.
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