Cape pondweed or water hawthorn (Aponogeton distachyus): flowering stems and leaves. Coloured zincograph by L. Constans, c. 1851, after himself.

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Cape pondweed or water hawthorn (Aponogeton distachyus): flowering stems and leaves. Coloured zincograph by L. Constans, c. 1851, after himself. Wellcome Collection. Public Domain Mark. Source: Wellcome Collection.