Beverly, I think some of the big box stores like Walmart and Home Depot etc. get their plants from wholesale growers in the southern part of Florida and one that I see for sale quite often is
Mexican Petunia (Ruellia simplex) which is listed as a Category I non-native invasive here in Florida but is grown as an annual in other parts of the U.S.A.
I really appreciate all the work that you and Janet are doing trying to find the true identity of that Turnera plant. Yours looks exactly like the one that appeared in my yard; likely a gift from the birds!
