Stem ca. 1.5 m tall, glabrous, branched. Leaf blade ca. 18 cm wide, base cordate; primary lobes separate for at least 60% of blade radius; central lobe rhombic, 3-lobulate, distally few lobulate or few dentate, apex acuminate; ultimate lobules lanceolate; proximal leaves usually withered. Compound raceme ca. 55 cm, many flowered; bracts leaflike or lanceolate. Pedicels 0.6--3 cm, distally slightly curved; bracteoles distal, lanceolate-linear, 4--6 mm. Sepals blue, abaxially sparsely puberulent; spur cylindric, 1.1--1.2 cm, straight, base 3--4 mm in diam.; other sepals 0.9--1.3 cm. Petals entire, glabrous. Staminode limb orbicular-ovate, 2-lobed, densely yellow barbate. Filaments glabrous. Carpels 3; ovaries densely yellowish puberulent. Fl. Jun--Jul.
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