Stem 30--60 cm tall, sparsely hispid proximally, glabrous distally to middle, branched. Leaf blade 3--19 cm wide, base cordate; primary lobes separate for at least 75% of blade radius; central lobe rhombic or rhombic-cuneate, 3-lobulate, distally incised dentate, apex acute; ultimate lobules narrowly triangular to linear; proximal leaves not withered. Raceme 7--18(--30) cm, 5--10(--17)-flowered; rachis glabrous; proximal bracts 3-parted, distal ones undivided, oblong or linear. Pedicels 1.7--8 cm, glabrous, rarely with sparse, rigid hairs apically; bracteoles distal, lanceolate-linear or subulate, 5--10 mm. Sepals purple-blue, abaxially shortly strigose, rarely hirsute, corniculate near apex; spur cylindric-subulate, 1.9--2.3 cm, slightly recurved or U-shaped, base 2.5--3 mm in diam.; other sepals 1.2--1.9 cm. Petals undivided, glabrous. Staminode limb obovate, 2-lobed, 2-cleft, or emarginate, yellow barbate. Filaments glabrous. Carpels 3; ovaries densely pubescent. Fl. Jun--Oct.
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