Swamp Buttercup blooms in early to late June. It has a smooth, hollow stem which is quite weak, hence the plant often looks matted or reclined.
Six petals, very shiny similar to other Buttercups.
Leaves are short stalked and in 3 segments. Note the bristly seed pod in the last picture. Seeds (achenes) are flat with one end terminating in a sharpened point.
Environment: Grows well in moist meadows or thickets. Tolerates shaded areas.
These  specimens found in G. Ross Lord Park off Dufferin Avenue North, Toronto.

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