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The leaves are kidney-shaped and reach 6 cm (2 + 1 ⁄ 2 in) long. [3] The flowers are normally either dark violet or white and are scented. [1] The style is hooked (and does not end with a rounded appendage). The perennial flowers mature when the plant is at a height of 4–6 in (10–15 cm) and a spread of 8–24 in (20–61 cm). [1]