Trifid Bur-marigold - Bidens tripartita


    Very variable plant to about 50 cm. Erect stems. Leaves opposite, usually three lobed occasionally 5 lobed with lanceolate, coarsely toothed divisions. Leaf stalks are short and winged. Flowerheads yellow 10 to 25 mm. Erect in branched clusters. Achenes with 3 or 4 barbed bristles. Detailed examination of the plant is necessary for a safe id.

    Similar Species

    Beggarticks (Bidens frondosa)

    Identification difficulty

    Damp habitats on mildly acid or calcareous soils.

    When to see it

    July to September.

    Life History


    UK Status

    Locally frequent in England but less so in Scotland and Wales.

    VC55 Status

    Occasional in Leicestershire and Rutland. In the 1979 Flora survey of Leicestershire it was found in 50 of the 617 tetrads.

    Leicestershire & Rutland Map

    UK Map