Subrotunda is a South American short lived perennial although since it self seeds you are unlikely to lose it. It was only found this century near Iguassu Falls. It stands up straight towards a metre with lots of bright orange flowers. Recently there has been one called white, which is not a bright white, and has a pinkish edge to it. In tropical areas it could become weedy. Sun or shade doesn’t seem to matter.
Birds love it.
It is fairly newly available but in stock.