A native tree with an unusual name sparks interest across the South.Credit: mirceax/Getty ImagesEarly last summer, my children had a distinctly Appalachian experience.They were in the drive-thru of McDonald’s with my mom (because what are grandmothers for if not for stuffing you full of the kinds of foods your dad won’t let you eat?). As they were moving through the line, they spotted a group of people with baskets picking fruit out of a row of …