Stems 40-200 cm; base green, pubescent or glabrous. Leaves cauline, 7-26 at anthesis; petiole 1-18 cm. Leaf blade round to pentagonal, 3-15 × 6-22 cm, ± puberulent; ultimate lobes 3-9, width 8-30 mm. Inflorescences 25-100(-more)-flowered; pedicel 1-3(-5) cm, glabrous to pubescent; bracteoles 2-5(-9) mm from flowers, green, linear, 5-9 mm, ± puberulent. Flowers: sepals blue, white, or purple, ± puberulent, lateral sepals spreading, 12-23 × 4-12 mm, spurs straight, ascending ca. 45° above horizontal, 15-22 mm; lower petal blades elevated, exposing stamens, 3-5 mm, clefts 0.2-1 mm; hairs sparse or dense, mostly near center of blade, yellow or white. Fruits 13-20 mm, 3.5-4.5 times longer than wide, ± puberulent. Seeds winged; seed coats ± with small wavy ridges, cells elongate, surface roughened.
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A tall, stout, European sp. with a long, dense infl, is widely cult. and locally adventive. It has pubescent stems, scarcely cleft lower pet, and cellular-reticulate seeds.
Can be grown by cuttings, divisions or seedlings. Seeds needs stratification.
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