Acorn is the seed of the oak or Quercus serrata tree, which is found all over the North and South. I'll give you a picture of an acorn and look at its very distinctive leaves, which you'll definitely recognize if it's in your neighborhood. /i?ct=503316480&z=0&tn=baiduimagedetail&word=%E8%DD&in=26902&cl=2&cm=1&sc=0&lm=-1&pn=3&rn= 1