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Female alder catkins after shedding their seeds Alnus serrulata male catkins. 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.
A. glutinosa is a tree that thrives in moist soils, and grows under favourable circumstances to a height of 20 to 30 metres (66 to 98 feet) and exceptionally up to 37 m (121 ft). [4] Young trees have an upright habit of growth with a main axial stem but older trees develop an arched crown with crooked branches.
In addition to its use as a nitrogen fixer, red alder is occasionally used as a rotation crop to discourage the conifer root pathogen Phellinus weirii (causing laminated root rot). Alnus rubra are occasionally planted as ornamental trees and will do well in Swales , riparian areas, or on stream banks, in light-textured soils that drain well.
Alnus incana, the grey alder, tag alder or speckled alder, is a species of multi-stemmed, shrubby tree in the birch family, with a wide range across the cooler parts of the Northern Hemisphere. Tolerant of wetter soils, it can slowly spread with runners and is a common sight in swamps and wetlands.
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. It takes about 10 yrs to mature.
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. [3]
Walter — Derived from Germanic roots, meaning "ruler of the army." 3. Harold — An Old English name meaning "army ruler" or "leader." ... 91. Vernon — Old French, meaning "alder tree." 92 ...
Alnus nepalensis is a large deciduous alder with silver-gray bark that reaches up to 30 m in height and 60 cm in diameter. The leaves are alternate, simple, shallowly toothed, with prominent veins parallel to each other, 7–16 cm long and 5–10 cm broad. The flowers are catkins, with the male and female flowers separate but produced on the ...