Page 491 of Florence, by the way of Leghorn, in 1833, and consist of two kinds -- the small, round, esteemed best for oil, and a much larger and more oval-fruited sort, which turns white before it becomes purple, the latter having been sent as stalks to engraft the other upon.    From Wordnik.com.  [Resources of the Southern Fields and Forests, Medical, Economical, and Agricultural. Being also a Medical Botany of the Confederate States; with Practical Information on the Useful Properties of the Trees, Plants, and Shrubs] Reference