Stem 60--80 cm, sparsely pubescent proximally, glabrous distally, simple. Leaf blade 6--9 cm wide, base cordate; primary lobes separate for at least 60% of blade radius; central lobe rhombic, 3-cleft, distally sparsely lobulate-dentate, apex acuminate; ultimate lobules lanceolate; proximal leaves usually withered. Raceme ca. 15 cm, ca. 16-flowered; rachis glabrous; proximal 3 bracts leaflike, others undivided, linear. Pedicels 1.5--2 cm, glabrous; bracteoles distal, narrowly linear, 7--9 mm. Sepals blue-purple, abaxially glabrous; spur cylindric-subulate, 1.3--1.7 cm, straight, base 2.6--3 mm in diam.; other sepals 0.9--1.2 cm. Petals undivided, glabrous. Staminode limb broadly ovate, 2-lobed, yellow barbate, long ciliate near apex. Filaments glabrous. Carpels 3, glabrous. Fl. Jul.
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