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DescriptionAnnual or perennial herb, with long, semi-succulent, thick, prostrate or floating stems, often rooting at the nodes. Leaves variable, ovate, triangular, lanceolate or linear; base truncate, cordate, sagittate or hastate. petiole thick, hairless. Inflorescence 1-few-flowered. Corolla 4-10 cm long, funnel-shaped, purple, pink or white with a darker centre. Capsule spherical, hairless. Seeds pubescent.