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SQUARE-STALKED WILLOWHERB Epilobium tetragonum (Onograceae) Height to 1m. Upright, downy perennial with 4-ridged stems (sometimes winged). Found in damp woods and on riverbanks. FLOWERS are 6-8mm across (upright in bud) with pink petals and a club-shaped stigma (Jul-Aug). FRUITS are pods (6-10cm long) that contain cottony seeds. LEAVES are narrow and finely toothed. STATUS-Common only in England and Wales.