Stem 50--100 cm tall, glabrous, simple or branched. Leaf blade 7--10 cm wide, base cordate; primary lobes separate for at least 75% of blade radius; central lobe rhombic, entire or 3-lobulate, distally dentate, apex acute; ultimate lobules ovate or narrowly so; proximal leaves usually withered. Raceme 8--11 cm, 10--15-flowered, retrorsely puberulent, sometimes yellow glandular puberulent; proximal bracts 3-parted, distal ones lanceolate-linear or linear. Pedicels 0.8--2.6 cm; bracteoles borne proximally or near middle of pedicel, linear, 5--8 mm. Sepals purple, abaxially sparsely puberulent; spur subulate, 2--2.1 cm, base 2--3 mm in diam.; other sepals 1.3--1.6 cm. Petals emarginate or entire, glabrous. Staminode limb suboblong, 2-cleft, yellow barbate. Filaments glabrous. Carpels 3, glabrous. Fl. May.
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