Stem 65--100 cm tall, glabrous, branched distally. Leaf blade 10--14 cm wide, base cordate; primary lobes separate for at least 75% of blade radius; central lobe rhombic, 3-cleft, distally few lobulate and dentate, apex acute; ultimate lobules narrowly ovate; proximal leaves usually withered. Compound raceme ca. 30 cm, 14-to many flowered, yellow glandular puberulent; bracts leaflike, lanceolate, or linear. Pedicels 2.2--6 cm; bracteoles borne near middle of pedicel or distally, subulate, 5--7 mm. Sepals blue-purple, abaxially sparsely glandular puberulent, 2-cleft corniculate near apex; spur subulate, 1.8--2 cm, U-shaped, base 2--3 mm in diam.; other sepals 1--1.5 cm. Petals 2-lobed, glabrous. Staminode limb obtrapezoid, 2-cleft, yellow barbate. Filaments glabrous. Carpels 3(or 4), glabrous. Fl. Jul--Sep.
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