The largest species are red alder (A. rubra) on the west coast of North America, and black alder (A. glutinosa), native to most of Europe and widely introduced elsewhere, both reaching over 30 metres …

Alder, genus of about 30 species of ornamental shrubs and trees in the birch family (Betulaceae). Alders are distributed throughout the Northern Hemisphere and in parts of western South America on cool …

Jul 25, 2024 · Alder trees (Alnus spp.) include 30 species of trees in the birch family. Learn their main characteristics, growing tips, and how to identify them.

Dec 29, 2024 · There are two main types of alder trees: red alder (Alnus rubra) and black alder (Alnus glutinosa). Red alder trees are primarily found in North America, particularly in the Pacific Northwest, …

Alder (Alnus glutinosa) is the most common tree in wetland forests, and it improves soil fertility through its ability to fix nitrogen from the air. Common or black alder occurs throughout most of Europe and …

Dec 3, 2025 · The alder is a widespread genus of deciduous trees and shrubs known for their rapid growth and ability to thrive in poor soils. Belonging to the genus Alnus, these plants are members of …

Alnus glutinosa, the common alder, black alder, European alder, European black alder, or just alder, is a species of tree in the family Betulaceae, native to most of Europe, southwest Asia and northern Africa.

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Alder trees are closely related to birch trees, as they both belong to the same scientific family. There are several dozen species of alder trees, all belonging to the Alnus genus. Alder trees grow primarily …

The red alder, A. rubra, is an important timber hardwood on the North American Pacific coast. Alder is a preferred wood for charcoal making, and is popular as a material for electric guitar bodies.