Caudex obconical, to 3.5 cm, to 1.2 cm in diam. Stem twining, rarely proximally suberect, branched, sparsely retrorse pubescent. Middle cauline leaves long petiolate; petiole 3.5--5.5 cm, sparsely pubescent; leaf blade ovate-pentagonal, 7--10 × 8--11 cm, abaxially glabrous, adaxially sparsely appressed pubescent, base cordate, 3-sect; segments shortly or long stipitate; central segment rhombic or rhombic-ovate, apex acuminate, below middle 3-fid; lateral segments obliquely flabellate, unequally 2-parted. Inflorescence terminal or axillary, several flowered; rachis and pedicels densely spreading pubescent; bracts linear, small. Pedicels decurved, 1.5--2.5 cm, with 2 bracteoles near middle; bracteoles subulate, 1.5--2 mm. Sepals blue, abaxially densely pubescent; lower sepals 0.7--1 cm; lateral sepals 1.2--1.4 cm; upper sepal high galeate, 1.6--1.9 cm high, lower margin 1.4--1.6 cm, slightly concave. Petals glabrous; limb ca. 9 mm; lip ca. 5 mm; spur incurved or subcircinate, ca. 2 mm. Stamens glabrous or sparsely pubescent. Follicles erect, ca. 2 cm. Seeds ca. 3 mm. Fl. Aug--Sep.
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