Stem 0.8--1.4 m tall, glabrous, simple or branched distally. Leaf blade 7--10 cm wide, base cordate; primary lobes separate for at least 60% of blade radius; central lobe narrowly rhombic, 3-lobulate, distally entire or few dentate, apex acute; ultimate lobules narrowly ovate or lanceolate; proximal leaves usually withered. Raceme 12--20 cm, 6--10-flowered; rachis glabrous; bracts linear or subulate. Pedicels 1.5--3.5 cm, distally appressed puberulent; bracteoles distal, subulate, 2.5--3.5 mm. Sepals blue-purple, abaxially densely appressed puberulent; spur cylindric-subulate, 2.1--2.2 cm, base 2.5--4 mm in diam.; other sepals 1.1--2 cm. Petals undivided, glabrous. Staminode limb broadly obovate, 2-lobed, yellowish barbate. Filaments glabrous. Carpels 3; ovaries puberulent. Fl. Jul--Aug.
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