Alders are trees of the genus Alnus in the birch family Betulaceae. The genus includes about 35 species [2] of monoecious trees and shrubs, a few reaching a large size, distributed throughout the north temperate zone with a few species extending into Central America, as well as the northern and southern Andes. [1]

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. It thrives in wet locations where its association with the bacterium Frankia alni enables it to grow in poor quality soils.

4 天之前 · alder, (genus Alnus), 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 at elevations up to 2,500 metres (8,200 feet).

Scientific name: Alnus glutinosa. Family: Betulaceae. Origin: native. Conical in shape, mature trees can reach a height of around 28m and live to approximately 60 years. The bark is dark and fissured and is often covered in lichen. Twigs have a light brown, spotted stem which turns red towards the top. Young twigs are sticky to touch.

Common Name(s): Alder, aliso Distribution: Primarily temperate regions of the Northern Hemisphere Genus Size: Around 50 species (with nearly 200 additional species names treated as synonyms)

Alnus serrulata, commonly called tag alder, smooth alder or hazel alder, is a multi-stemmed, suckering, thicket-forming, large deciduous shrub or small tree that typically grows to 10-20’ tall. It is most often seen in a multi-trunked form with a densely branched crown.

Alnus glutinosa, commonly called black alder (also common alder or European alder), is a small to medium-sized deciduous tree that is distinguished by its gummy young twigs and leaves and its obovate to rounded, glossy dark green leaves (to 4” long) with doubly toothed margins and blunt to sometimes notched apices. As a single trunk tree, it ...

Black alder is a medium short-lived deciduous tree in the birch family (Betulaceae) native to Europe, western Asia, and northern Africa. Early European colonists brought the black alder to North America where it was planted as an ornamental and to prevent erosion. The genus, Alnus, is Latin for alder.

Red alder (Alnusrubra) is the only commercial species in North America. Red alder is the most common hardwood in the Pacific Northwest and the largest of the American alders. It is a fast-growing, pioneer species and has nitrogen-fixing nodules on its roots. The wood is diffuse porous, moderately light, and soft. Alnusmaritima-seasidealder.

Scientific name: Alnus glutinosa. Pronunciation: AL-nus gloo-tih-N0-suh. Common name (s): Common alder, black alder, european alder. Family: Betulaceae. USDA hardiness zones: 3A through 7B (Fig. 2) Origin: not native to North America. Invasive potential: invasive non-native. Uses: screen; specimen; reclamation; shade.