The map above shows the areas that are crowded with the Celastrus Orbiculatus, also known as Oriental Bittersweet. This plant originated in China, Japan and Korea. It was introduced to the U.S.A. in the 1860's as an innocent decorative ivy. But now, the Oriental Bittersweet is an invasive that is a danger to many trees. It strangles them by wrapping itself around the tree trunk and suffocating it over years and years. The berries of the Oriental Bittersweet are a bright red and have orange husk that come in fours around the berry. The stem is tough, great for killing trees, brown, and spits off at the end where the berries are. The berries usually come in groups of three or four.