Stem 50--100 cm tall, glabrous, branched distally. Leaf blade ca. 10 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 long acuminate; ultimate lobules lanceolate; proximal leaves usually withered. Raceme ca. 15 cm, ca. 10-flowered, retrorsely puberulent; proximal bracts leaflike, distal ones linear or linear-subulate. Pedicels 1.5--5 cm; bracteoles distal, narrowly linear or subulate, 3--7 mm. Sepals blue-purple, abaxially puberulent, sometimes corniculate near apex; spur subulate, 1.5--2 cm, recurved or straight, base 2--3 mm in diam.; other sepals ca. 1 cm. Petals emarginate, glabrous. Staminode limb ovate, 2-lobed, yellow barbate. Filaments glabrous. Carpels 3; ovaries glabrous or sparsely puberulent. Fl. Jul--Aug.
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