The term POISONOUS EVERGREEN refers to two plants, the YEW (3 letters) and the Oleander (8 letters). Both of these plants are evergreen shrubs or trees that are highly toxic if ingested. The YEW is native to Europe, North Africa, and parts of Asia, while the Oleander is native to the Mediterranean region and parts of Asia. Both plants contain a variety of toxins, including alkaloids, glycosides, and saponins, which can cause serious illness or death if ingested.