Thank you Janet!
You have done a lot of research here and now it is my turn...it may take me awhile, but i will follow up on the links and possibly we can come to some conclusions about this Turnera. From what i have seen and read so far there appears to be long-standing confusion regarding this plant.
I would like to ask a question though. Many of the photos that we are looking at here are of plants growing in the wild. My photos are of a plant tended to and watered and fertilized, etc because i was growing it for the caterpillars to eat and i wanted lots of lush foliage to offer them. Do you think this should be (could be) a factor to be considered as we proceed?