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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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).