I just remembered wild plums too...good jam and jelly.
Mayhaw grows wild in the South and makes wonderful jelly too.
We had a lot of wild plums growing on the roadsides. There were also the small wild pears with thorns on the branches. We also had huckleberries and persimmons growing by the creek.
We had a garlic looking plant that was wild. The smell would make a skunk run and hide, especially when it was several days old.