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WATER DOCK Rumex hydrolapathum (Polygonaceae) Height to 2m. Large, unbranched perennial, associated with damp habitats such as ditches, river banks, canals and marshes. FLOWERS are borne in tall, dense spikes (Jul-Sep). FRUITS are triangular, with few small teeth and 3 tubercles. LEAVES are oval, up to 1m long and taper at base. STATUS-Widespread but absent from N; commonest in S and E England.