Alnus is a term that is often associated with a type of tree or shrub found in temperate regions. There are several synonyms used for alnus, including the common name of Alder. The Alder tree can grow up to 80 feet tall and is often found near water sources such as rivers and lakes. Other synonyms for alnus might include the Latin term for the Alder, Alnus glutinosa. Additionally, some common names for different species of the alnus might include black alder, red alder, gray alder, and mountain alder. Regardless of the specific synonym used, alnus trees and related species are an important part of the natural landscape in many regions of the world.