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TRIFID BUR-MARIGOLD Bidens tripartita (Asteraceae) Height to 60cm. Branched, almost hairless annual with reddish stems. Grows in damp ground and shallow water. FLOWERS in heads, 10-25mm across, with yellow disc florets (no ray florets) and 5-8 leaf-like bracts below (Jul-Oct). FRUITS are oblong and flattened with 1 barbed bristle. LEAVES are stalked and 3-lobed. STATUS-Locally common only in S.