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Is this plant in my urban garden poison ivy?

  • Toronto, Ontario area.
  • July 19, 2023
  • Full shade
  • Three leaves; toothed but not serrated.

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Possible Answer: (I can’t post an answer due to the question being closed)

I suspect it is Boston Ivy (Parthenocissus tricuspidata).

Eastern Poison Ivy vs Boston Ivy

Boston Ivy: A deciduous woody vine native to east Asia, introduced in North America. Established in numerous scattered locations, mostly around urban areas. It is a close relative of the native Virginia creeper.

Middle leaflet has no stem or a short stem not much longer than that of side leaflets.

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Related: Vine has simple and compound leaves

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  • $\begingroup$ Virginia creeper has leaves in 5s, not leaves in 3s. Definitely not virginia creeper. $\endgroup$
    – bob1
    Jul 31, 2023 at 1:41

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Almost certainly Toxicodendron (poison ivy) genus; I think Toxicodendron rydbergii (western poison ivy). Leaves are in threes, with the central one longer than the others. Leaves are variable in toothing and serrations on the same plant. This one will be a shrub rather than a climbing vine.

Incidentally, the other, dark-green leaved, plant in there is common ivy (Hedera helix).

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