Stem 50--90(--120) cm tall, sparsely retrorsely puberulent, often glabrescent proximally, branched. Leaf blade 7--12 cm wide, base cordate; primary lobes separate for at least 90% of blade radius; central lobe narrowly rhombic or lanceolate, indistinctly 3-lobulate, distally few dentate, apex acute; ultimate lobules narrowly triangular; proximal leaves withered. Raceme 3--12 cm, 3--8-flowered, retrorsely puberulent; proximal bracts leaflike, distal ones elliptic or oblong. Pedicels 0.9--2 cm; bracteoles distal, oblanceolate-linear or linear, 3--7 mm. Sepals purple, abaxially puberulent; spur subulate, 2.2--2.5 cm, nearly straight, base 3--3.5 mm in diam.; other sepals 1--1.2 cm. Petals 2-lobed, glabrous. Staminode limb obovate, 2-cleft, sparsely white barbate. Filaments glabrous. Carpels 3, glabrous. Fl. Jul--Aug.
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