131908 WATER-PLANTAIN Alisma plantago-aquatica (Alismataceae) Height to 1m. Aquatic and emergent perennial that grows on the margins and in the shallows of ponds and lakes. FLOWERS are 1cm across, whitish lilac and 3-petalled; borne in branched whorls (Jun-Sep). FRUITS are greenish and nut-like. LEAVES are oval and long-stalked with parallel veins. STATUS-Locally common except W England, W Wales and N Scotland.