Fawn Pond, a part of the Cuyahoga Valley National Recreation Area (Ohio), originated as a water-filled gravel pit. The study area, consisting of Fawn Pond and surrounding land, contains three taxonomic subdivisions, 72 families, 193 genera, and 310 species and hybrids of vascular plants. Forty-eight species and hybrids represent additions to a recently produced flora of the Cuyahoga Valley National Recreation Area. Three species augment a flora of the glaciated Allegheny Plateau region of Ohio. One additional species represents a state record for Ohio. The total number of species is striking, because of the long history of severe, human-induced disturbances of the area.