There's a long list of Hesperis, it could be Hesperis matronalis 'Alba', but it's not guaranteed.
Dame's Rocket (Hesperis matronalis 'Alba')
The form 'Alba' might be the same as Hesperis matronalis var. albiflora ..
http://www.rhsplants.co.uk/pla...
However, that is not listed on the Plant List.
http://www.theplantlist.org/tp...
The list on ATP ..
http://garden.org/plants/brows...
If it's a plant which appears to be endemic then you should check which species are in the area.
Strangely, a search for the genus in Ohio first brought up the straight species Hesperis matronalis with two subspecies, ssp. candida and ssp. voronovii ..
http://luirig.altervista.org/f...
After clicking on one of them, then going back I had to reselect the state Ohio, then it only showed Hesperis matronalis. Any subspecies, as far as I know, can be included in the straight species as they are essentially the same species with slight variations often due to location.
Hesperis matronalis is the only species it could be assuming we have got the genus correct, it looks like it to me.
http://luirig.altervista.org/f...
