Stem 60--100 cm tall, glabrous, branched. Leaf blade 11--12 cm wide, base cordate; primary lobes separate for at least 60% of blade radius; central lobe ovate-rhombic, 3-lobulate, distally incised dentate, apex acuminate; ultimate lobules narrowly ovate; proximal leaves usually withered. Compound raceme (5--)12--18 cm, densely yellow glandular puberulent mixed with a few retrorse, white hairs; bracts linear or filiform. Pedicels 0.7--3 cm; bracteoles borne near middle of pedicel or distally, filiform, 4.5--7 mm. Sepals blue-purple, abaxially puberulent; spur subulate, 1.5--2.1 cm, spirally curved, base 2--3.5 mm in diam.; other sepals 1.3--2 cm. Petals undivided, glabrous. Staminode limb ovate, 2-cleft, yellow barbate. Filaments glabrous. Carpels 3; ovaries glabrous or sparsely puberulent. Fl. Jul--Aug.
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