Answer: Though there are about 60 species in the Turnera genus, only one is commonly cultivated: Turnera ulmifolia, also called sage rose.
In frost-free regions the plant grows permanently in flower beds; in cooler regions in can be planted outdoors after all danger of frost has past, then brought in in the fall and wintered indoors.
It's quite an unusual plant--I'm sure that's why you've had trouble finding information. I don't see any reference to it reseeding itself, so you might want to save some seeds for planting next year, just in case.
Q&A Library Searching Tips