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It is a perennial herbaceous plant with stout stems growing to 1.5 metres (4.9 ft) tall. The leaves are palmately compound with 9–17 leaflets 3–15 centimetres (1.2–5.9 in) long. The flowers are produced on a tall spike, each flower 1–1.5 centimetres (0.39–0.59 in) long, most commonly blue to purple in wild plants.