Help with ID of flower in Ohio

Ohio, United States

I shot this photo in Inniswood Metro Gardens near Columbus, Ohio. A number of other flowers were growing in this area and a card provided identities. Unfortunately, the card apparently wasn't accurate because nothing I've found online when Google-ing the names matches what I shot. This plant was at least four feet tall with a number of flowers growing off a straight stem.

Can someone help me with an ID?

Thanks.

pat