Thanks, Jay!
I saw Hibiscus mutabilis in it, too, but it doesn't look quite right for any cultivar/selection that I could find.
Also, I didn't think straight Hibiscus mutabilis would be hardy in Indiana.
Someone on Gardenweb claimed that, "I DID once have a Snyder hybrid of mutabilis and moscheutos."
An H. mutabilis x H. moscheutos hybrid seems like a possibility.
In another thread (and this thread), Jayce said the flowers always remain partially closed which would rule out 'Hapa Red', I think.
The thread "Giant Plate Hibiscus" in
Ask a Question forum
FYI, the "green base" is called a calyx. The plural term is calyces.
Also, there is a Pet thread if your conure would like some new friends.
The thread "Pet Love 2022" in
Sandbox forum
