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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.

enter image description here

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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 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 at 22:13
  • $\begingroup$ Thanks. Opposite is correct. Not Dahlia - too hairy. $\endgroup$
    – bob1
    Jul 8 at 0:41
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    $\begingroup$ 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 at 1:52

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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).

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