104158 AMPHIBIOUS BISTORT Persicaria amphibia (Polygonaceae) Height to 40cm. Perennial of ponds and nearby dry land. Aquatic form has floating stems. FLOWERS are pink; borne in cylindrical spikes (Jun-Sep). FRUITS are nut-like. LEAVES are narrow; aquatic forms are hairless, truncate at the base and long-stalked; terrestrial forms are downy, rounded at the base and short-stalked.