Hi, Mike, BMC, I think you are right, this is annonaceae, today I back to take the leave, it s not tree, but vines, with the leave very similar to annonaceae. I m collecting annonaceae edible fruit species too, esp annona sp, and duguetia sp (also ever buy Annona conica, hayesii, spraguei and annona edulis, from rarepalm with no luck).
This is the pic of leaves: