Stem 0.6--1.8 m tall, glabrous, simple or branched distally. Leaf blade 7--12 cm wide, base deeply cordate; primary lobes separate for at least 60% of blade radius; central lobe rhombic, 3-cleft, distally few lobulate and dentate, apex shortly acuminate; ultimate lobules triangular; proximal leaves withered. Raceme often terminal and compound, 9--14 cm, 6--16-flowered, retrorsely puberulent and yellow glandular puberulent; proximal bracts leaflike, distal ones small, lanceolate-linear to filiform. Pedicels 1--4.8 cm; bracteoles borne near middle of pedicel or distally, linear or filiform, 1.5--4 mm. Sepals blue, abaxially densely puberulent; spur subulate, 1.8--2.4 cm, recurved, U-shaped, or spirally curved, base 2.8--3.5 mm in diam.; other sepals 1.1--1.5 cm. Petals 2-lobed, glabrous. Staminode limb narrowly obovate, 2-parted, yellow or white barbate. Filaments glabrous. Carpels 3; ovaries sparsely puberulent or glabrous. Fl. Aug--Sep.
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