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Alder is the common name for about 30 kinds of trees and shrubs of the Alnus genus. They are a part of the birch family ( Betulaceae ). Most of them are smaller in size. Leaves are mostly deciduous, only very few alders are evergreen . Alder trees are found in all parts of the northern hemisphere and they are often found on poor and/or wet soil.
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 wet sites. Several species are cultivated for their useful wood.
Alder is the common name for about 30 kinds of trees and shrubs of the Alnus genus. They are a part of the birch family (Betulaceae). Most of them are smaller in size. Leaves are mostly deciduous, only very few alders are evergreen.
Alder is the common name for any of the various deciduous trees and shrubs comprising the flowering plant genus Alnus of the birch family (family Betulaceae), characterized by alternate, simple leaves, scaly bark, and flowers as male and female catkins that appear on the same plant, with the woody, cone-like female catkins opening to release ...
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. Distribution. Physical Characteristics. Reproduction. Ecological Relationships. Sources and further reading. Global Distribution.
Alder trees grow primarily near bodies of water in cooler temperate regions throughout the Northern Hemisphere. They can also be found at elevations up to 8,200 feet in parts of South America. The most notable physical feature of alder trees is their rounded female catkins, which mature into strobiles that look like small pine cones.
Red alder. Alnus rubra, or red alder, is a deciduous broadleaf tree native to western North America. It is the largest species of alder in North America and one of the largest in the world. It can get to heights of 20 to 30 meters.
