Last spring Les Davis made a trip to Florida and collected pollen of Asimina obovata and overnight expressed it to me. My pawpaws, A.. triloba were in flower. Although I didn't bag the flowers I did close the flower openings with masking tape to reduce the chances of external pollination. I have a few more seeds than I can use and will share some. Please reimburse the postage. I'd like to limit the seeds to 4 per request. I can't guarantee they aren't pure triloba.
Les also sent pollen of A. incarna (also may be known as incarnata) and have seeds of them. I have these hybrids made a few years back and are presently in bloom. The flower opens white then turns purple in a few days. The raccoons beat me to the fruit last year so haven't had the pleasure or disappointment.