Ash (Fraxinus, Ukrainian: yasen). A genus of broad- leaved trees of the olive (Oleaceae) family. In Ukraine four species of ash are found. Most widespread is the common European ash (F. excelsior), which reaches a height of 40 m. It likes light and warmth, grows quickly, and can be found everywhere in deciduous forests. It is used mostly in furniture-making and building. The red ash (F. pensylvanica), white ash (F. americana), and green ash (F. lanceolata) are cultivated for decorative purposes in parks and gardens.