Stem (25--)40--75 cm tall, glabrous, branched. Leaf blade 4--9 cm wide, base cordate; primary lobes separate for at least 75% of blade radius; central lobe rhombic, 3-parted to near midvein, distally entire or 1-lobulate, apex acute; ultimate lobules triangular to lanceolate-linear; proximal leaves withered or not. Raceme (5--)8--22 cm, (2--)6--15-flowered, glabrous to subglabrous; proximal bracts leaflike, distal ones linear. Pedicels 2.5--9.5 cm; bracteoles distal, green, subulate or lanceolate-linear, 4--5(--12) mm. Sepals blue, abaxially puberulent; spur subulate, 1.8--2.5 cm, straight, base 2.5--3 mm in diam.; other sepals 0.7--1.5 cm. Petals undivided, glabrous. Staminode limb broadly obovate, 5.5--7 mm, emarginate or 2-lobed, yellow barbate. Filaments glabrous. Carpels 3; ovaries densely pubescent. Fl. Jun--Oct.
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