Caudex carrot-shaped, ca. 4.5 cm, ca. 1.5 cm in diam. Stem twining, 1.5--2.4 m, sparsely retrorse and appressed pubescent. Proximal cauline leaves withered at anthesis, and middle ones slightly long petiolate; petiole 4--8 cm; leaf blade pentagonal, 5.5--8 × 10--11 cm, abaxially nearly glabrous, adaxially sparsely appressed pubescent, 3-parted; central lobe broadly rhombic, apex acuminate or long acuminate; lateral lobes obliquely flabellate, unequally 2-parted. Inflorescence terminal, 50--85 cm, 16--19-flowered; rachis and pedicels densely retrorse yellowish pubescent; bracts usually leaflike, distal ones linear, smaller. Pedicels 2.2--7 cm, oblique upward, with 2 bracteoles proximally or distally; bracteoles linear, 6--10 × 0.4--1 mm. Sepals blue-purple, abaxially densely pubescent; lower sepals ca. 2 cm; lateral sepals ca. 2.1 cm; upper sepal galeate, ca. 2.2 cm high, shortly beaked, 2--2.2 cm from base to beak, lower margin slightly concave. Petals glabrous; claw geniculate at apex; limb ca. 8 mm; lip ca. 5 mm, 2-lobed at apex; spur subcircinate, ca. 3 mm. Stamens glabrous; filaments entire, rarely 1-or 2-denticulate. Carpels 5, glabrous. Fl. Aug.
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