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Female alder catkins after shedding their seeds Alnus serrulata male catkins. Alders are trees that compose 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.
Alnus rubra is the largest species of alder in North America and one of the largest in the world, reaching heights of 20 to 30 metres (66 to 98 ft). The official tallest red alder (as of 1979) stands 32 m (105 ft) tall in Clatsop County, Oregon (US). [7] The trunks range from 25 to 50 centimetres (10 to 19⁄ in) in diameter. [8]
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.
Alnus rhombifolia, the white alder, is an alder tree native to western North America, from British Columbia and Washington east to western Montana, southeast to the Sierra Nevada, and south through the Peninsular Ranges and Colorado Desert oases in Southern California. [2] It occurs in riparian zone habitats at an altitudes range of 100–2,400 ...
Alnus subg. Clethropsis. (Ehrh.) K.Koch. Alnus alnobetula is a common tree widespread across much of Europe, Asia, and North America. [2] Many sources refer to it as Alnus viridis, the green alder, but botanically this is considered an illegitimate name synonymous with Alnus alnobetula subsp. fruticosa.
Alnus serrulata is a large shrub or small tree that may grow up to 2.5–4 m (8.2–13.1 ft) high and 15 cm (5.9 in) in diameter. The scientific name originates from alnus which is an old name for alder; serrulata points to the finely-toothed leaf margins which it possesses.
Alnus incana var. tenuifolia male flowers in early spring along the Columbia River. It is a small- to medium-sized tree 15–20 metres (49–66 ft) tall with smooth grey bark even in old age, its life span being a maximum of 60 to 100 years. The leaves are matte green, ovoid, 5–11 centimetres (2– in) long and 4–8 cm (– in) broad.
Alnus nervosus Dippel. Alnus cordata, the Italian alder, [1][2] is a tree or shrub species belonging to the family Betulaceae, and native to the southern Apennine Mountains (Campania, Basilicata and Calabria, mainly on western mountain sides) and the north-eastern mountains of Corsica. [3] It has been introduced in Sicily, Sardinia, and more ...
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