Pictorial guide to the flora of the British Isles

Home ⟩ Pictorial Guide ⟩ Asteraceae / Compositae ⟩ Bidens tripartita / trifid bur-marigold

Bidens tripartita L.

trifid bur-marigold (Asteraceae / Compositae)

 SpreadBias within British IslesDirection of bias
WidespreadSlight tendencySE
Plant Atlas 2020
BSBI Distribution Map

Bidens tripartita is a perennial herb, typically found on the edges of water-courses and ponds.

Oxford (VC23: Oxfordshire); 2011-08-31

 trifid bur-marigold / Bidens tripartita: _Bidens tripartita_ is a perennial herb, typically found on the edges of water-courses and ponds.

The leaves of Bidens tripartita often have a pair of basal lobes; even if the lobes are lacking, the lower leaves have a distinct, winged stalk, unlike the similar Bidens cernua.

Oxford (VC23: Oxfordshire); 2011-08-31

 trifid bur-marigold / Bidens tripartita: The leaves of _Bidens tripartita_ often have a pair of basal lobes; even if the lobes are lacking, the lower leaves have a distinct, winged stalk, unlike the similar _Bidens cernua_.

The achenes of Bidens tripartita are armed with 3 or so barbed bristles; all the barbs are directed backwards.

Noke (VC23: Oxfordshire); 2018-09-21

 trifid bur-marigold / Bidens tripartita: The achenes of _Bidens tripartita_ are armed with 3 or so barbed bristles; all the barbs are directed backwards.

All images copyright © Christopher J. Dixon unless otherwise indicated.

L-R: Bidens tripartita, Melilotus officinalis, Mimulus guttatus, Thalictrum flavum, Ranunculus peltatus, Anchusa arvensis, Malva alcea, Lolium perenne