Bittersweet is from

sources https://en.wikipedia.org/wiki/Bittersweet https://www.britannica.com/plant/bittersweet https://www.entm.purdue.edu/iisc/pdf/plants/more/oriental_bittersweet.pdf https://mnfi.anr.msu.edu/invasive-species/OrientalBittersweetBCP.pdf

http://arnoldia.arboretum.harvard.edu/pdf/articles/2014-71-3-untangling-the-twisted-tale-of-oriental-bittersweet.pdf