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GREATER WATER-PARSNIP Sium latifolium (Apiaceae) Height to 2m. Hairless perennial with hollow, ridged stems. Found in fens on riverbanks. FLOWERS are white and borne in terminal, long-stalked umbels, 6-10cm across (Jul-Aug). FRUITS are egg-shaped and ridged. LEAVES are pinnate with 4-8 pairs of narrow, toothed leaflets plus a terminal one. STATUS-Local, mainly SE England; commonest in E Anglia.