Rhamnaceae is a large family of flowering plants, mostly trees, shrubs, and some vines, commonly called the Buckthorn Family. The family contains 50-60 genera and approximately 870-900 species. Rhamnaceae have a worldwide distribution, but are more common in the subtropical and tropical regions. The earliest fossil evidence of Rhamnaceae is from t... Found on http://en.wikipedia.org/wiki/Rhamnaceae