The Alder Tree (Alnus glutinosa) is a native Irish tree, which has quite a history in Irish Folklore and History. It even has played a role in the naming of a number of Irish towns and villages. For example, Ballyfarnon (Béal Átha Fearnáin) in Country Roscommon translates to Mouth of the Ford of the Alder, and County Wexford, the town of Ferns comes from the Irish Word; Fearna (Alder Trees).