Are those the same as sand plums? We used to gather those from the wild bushes along the road in rural Oklahoma. Oh...sand plum jelly CAN NOT be beat! Wish I had some now. Summer in a jar!I would eat those till I was sick. Also I seem to remember these wild plums that would grow along fence lines that we loved. They were yellow. And may-pops! I liked to eat those when they were not fully ripe and sour. Nowadays I know those are called passion fruit.