It's been a pretty good year thus far for seeing and photographing rare flora. But few plants have been as rare as this one. Eastern Yampah (Perideridia americana) is only known from this one locale, and I counted about 75 plants on my visit last May 30. They occupy a fairly small roughly square area, and that's it. There doesn't appear to be any other Yampah plants in the woods. There must be something special about this one section of the woods.
Brian Riley rediscovered Yampah in Ohio - at this very spot - in 2012 or 2013. There was only one definitive Ohio record prior to this find, by the legendary Pickaway County farmer/botanist Floyd Bartley. Bartley's collection label says "... wet woods, 2 miles SE of Whisler, Salt Creek Twp., June 11, 1950. Riley's find was definitely not a rediscovery of Bartley's find, as the sites are about 15 miles apart.
There is an enigmatic Yampah record, reportedly from "prairies, Madison County" in the 1840's. However, there is no known specimen or other corroborating evidence so that one must be regarded as hypothetical. But as prairies or woodlands associated with prairies are the haunts for Yampah, a Madison County record would make sense.