Small-flowered buttercup
(Ranunculus micranthus)

aka hairy small-flowered buttercup. Similar to R. abortivus, but stems and upper leaves are hairy. Lower leaves deeply lobed, but thinner than those of R. abortivus, and tending to be longer than they are wide. Common in lawns, woodland edges, and mowed fields. MC (Ranunculaceae)