Stem 1.1--1.4 m tall, hispidulous proximally, glabrescent and few branched distally. Leaf blade 8--18 cm wide, base cordate; primary lobes separate for at least 60% of blade radius; central lobe narrowly rhombic or rhombic-cuneate, 3-lobulate, distally lobulate-dentate, apex acute; ultimate lobules lanceolate; proximal leaves usually withered. Raceme 17--26 cm, 16--25-flowered, yellow glandular puberulent; proximal bracts leaflike, distal ones navicular-oblong or obovate. Pedicels 1.3--3.8 cm; bracteoles proximal, similar to bracts, blue-purple, 4--8.5 mm. Sepals blue-purple, rarely white, abaxially glabrous; spur subulate, 1.6--1.7 cm, base 3--3.5 mm in diam.; other sepals 0.9--1.4 cm. Petals emarginate, glabrous. Staminode limb ovate, 2-lobed, yellow barbate. Filaments glabrous. Carpels 3, glabrous, rarely sparsely puberulent proximally. Fl. Jul--Aug.
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