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Alders are deciduous trees and shrubs with catkins of male and female flowers. They belong to the genus Alnus in the family Betulaceae, with about 35 species distributed in the north temperate zone and Central America.
Alder trees (botanical name Alnus) are tall deciduous trees known for their drooping flower clusters and brown woody cones called strobiles. Several species of alder trees are native to North America and Europe, with the Red Alder (Alnus rubra) and Black Alder (Alnus glutinosa) being the two most common.
Alnus is an ancient and complex genus originating in the late Cretaceous (Graham 1993; Chen, Manchester & Sun 1999). Something of the order of 40 species (their limits much debated) are distributed across the northern hemisphere, extending into the southern hemisphere in South America, where the genus reaches its southern limit in northern Argentina. Alders vary widely from tall, single ...
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 trees (Alnus spp.) include 30 species of trees in the birch family. Learn their main characteristics, growing tips, and how to identify them.
Alnus is a genus of about 50 species of temperate hardwood trees, mostly in the Northern Hemisphere. They have light to reddish brown heartwood, large aggregate rays, and good workability and stability.
The USDA Plants Database provides information on various plant species, including their characteristics, distribution, and conservation status.
Learn about the characteristics, uses, and cultivation of black alder, a deciduous tree native to Europe, Asia, and Africa. Find out how to identify, grow, and care for this tree that can fix nitrogen and tolerate wet soils.
The roots of many species from associations with soil bacteria to fix nitrogen from the air and subsequently enhance the fertility of the soil. Native to the Northern Hemisphere from the subarctic to the Himalayas and Andes, extending into the Southern Hemisphere in Peru. Alnus: Latin name for alder.
Alnus is characterized by winter buds with long stalks and two valvate scales, inflorescences borne in racemose clusters, and development of both pistillate and staminate inflorescences during the growing season prior to anthesis, with these fully exposed during winter.