Photographs: Lismore, Co.Waterford

Trifid Bur-marigold Bidens tripartita Scothóg leathan Family: Asteraceae Flowering July-September. Annual. Native. Ray-less yellow flower-heads with black-streaked, sepal-like inner bracts and long, leaf-like outer bracts. Opposite, stalked lower leaves, many usually with 1-2 pairs of lobes. A hairless plant with stout erect stems. Height to 70cm. Nutrient-rich gravel or mud by ponds, rivers, marshes. Similar: Nodding Bur-marigold, B. cernua has undivided leaves

Trifid Bur-marigold, Bidens tripartita, Scothóg leathan