Stem ca. 70 cm tall, usually hispid proximally, glabrous distally, branched or simple. Leaf blade 8--10 cm wide, base cordate; primary lobes separate for at least 75% of blade radius; central lobe rhombic-obovate, 3-lobulate, distally lobulate, apex acute; ultimate lobules narrowly ovate or linear-lanceolate; proximal leaves usually withered. Raceme 5--20(--30) cm, 5--10(--20)-flowered, glabrous or yellow glandular puberulent; bracts linear. Pedicels 1.5--3 cm; bracteoles proximal, subulate-linear, 2.2--4 mm. Sepals blue-purple, abaxially sparsely puberulent; spur subulate, 1.7--2 cm, sometimes U-shaped, base 3--4 mm in diam.; other sepals 1.2--2 cm. Petals undivided, glabrous. Staminode limb obovate, emarginate to 2-cleft, yellow barbate. Filaments glabrous. Carpels 3, glabrous. Fl. Aug.
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