What species of plant is this?

  • Location: Toronto area (Ontario, Canada)
  • Date: July 7, 2022
  • Conditions: Acid soil in shade
  • Height: Approx. 11 inches
  • Description: Younger leaves resemble tomato leaves. Main leaves are serrated. Opposite.

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August 25, 2022

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September 6, 2022

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  • $\begingroup$ I think the leaves are simple pinnate and alternating, though it is hard to tell from the photo. I want to say Dahlia, but the leaves don't look quite right. $\endgroup$
    – bob1
    Jul 7, 2022 at 21:38
  • $\begingroup$ @bob1 Thanks. If you click on the photo a couple of times in your browser, it should show the full photo, which is quite large. From there, you can zoom in. When we do that, I think it's a bit clearer that the leaves are opposite, not alternating. $\endgroup$
    – User1974
    Jul 7, 2022 at 22:13
  • $\begingroup$ Thanks. Opposite is correct. Not Dahlia - too hairy. $\endgroup$
    – bob1
    Jul 8, 2022 at 0:41
  • 1
    $\begingroup$ Can you post more photos of this plant? Closeups of the stem, roots (if you decide to kill or move it), and both surfaces of the leaves may help; however, flower photos are likely necessary for you to get a definitive identification (ideally from multiple angles). $\endgroup$
    – tyersome
    Jul 14, 2022 at 1:52
  • $\begingroup$ Nice updates. Should help quite a bit. $\endgroup$ Sep 6, 2022 at 17:19

1 Answer 1


I think that this is one of the beggarticks, in the genus Bidens. There are several possibilities in your area, including B. connata, B. frondosa, and B. vulgata. I think more detail would be needed for a finer identification.

The main features pointing me this way are the opposite, compound leaves, and the distinctive shape of the leaflets (ovate-lanceolate, serrated margins, attenuate tips).

  • 1
    $\begingroup$ Based on the number and type of bracts beneath the flowering head (aka "calyculus bractlets", about 8, not "foliaceous" but merely herbaceous), and the shape of the leaves (3-foliate), I think this is probably Bidens frondosa. $\endgroup$ Sep 7, 2022 at 0:09

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