Stems (33-)50-150(-280) cm; base reddish, ± puberulent. Leaves mostly cauline; basal leaves absent at anthesis except in small plants; cauline leaves 5-18 at anthesis; petiole 1-12 cm. Leaf blade round to reniform, 3-7 × 5-10 cm, nearly glabrous; ultimate lobes 0-27, width 5-40 mm (basal), 0.5-6 mm (cauline). Inflorescences 10-40(-80)-flowered, open, narrowly pyramidal; pedicel spreading, (1-)2-5 cm, ± puberulent; bracteoles (2-)7-15(-25) mm from flowers, green, linear, 3-7 mm, glabrous to puberulent. Flowers: sepals red, glabrous, lateral sepals forward pointing, 11-15 × 5-8 mm, spurs straight, stout, slightly ascending, 15-24 mm; lower petal blades nearly coplanar with claw, exposing stamens, 2-5 mm, clefts 0.5-1.5 mm; hairs centered at base of cleft, short, sparse, yellow. Fruits erect, 9-18 mm, 2.5-4 times longer than wide, glabrous. Seeds unwinged; seed coat cells with margins undulate, surfaces roughened. 2 n = 16.
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