Yellow wood sorrel. It looks a little bit like clover, but with those cute unmarked, heart-shaped leaves. The blooms here are closed. There is also a variety with purple flowers, which has leaves with violet undersides. Both kinds are edible and taste sour, like the sorrel vegetable (which they are not, however, related to).
Alongside the Reservoir, Central Park.
Addendum: here is an example of an open flower.
Yes i see those yellow ones in Baltimore. I thought they were a dufferent kind i plantrd but i see did not grow.
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