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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 rubra: red alder Betulaceae (birch family) Alnus rugosa: speckled alder Betulaceae (birch family) Alnus serrulata: common alder; hazel alder; tag alder; smooth alder Betulaceae (birch family) Alnus sinuata: Sitka alder Betulaceae (birch family) Alnus subcordata: Caucasian alder Betulaceae (birch family) Alnus tenuifolia: mountain alder ...
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.
This point of origin is supported by the fact that all six genera and 52 species are native to this region, many of those being endemic. All six modern genera are believed to have diverged fully by the Oligocene , with all genera in the family (with the exception of Ostryopsis ) having a fossil record stretching back at least 20 million years ...
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Frankia alni forms a symbiotic relationship exclusively with trees in the genus Alnus.These are widely distributed in temperate regions of the northern hemisphere. One species, Alnus glutinosa, is also found in Africa and another, the Andean alder, Alnus acuminata, extends down the mountainous spine of Central and South America as far as Argentina.