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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]
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.
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.
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; thin-leaf alder
Red alder is present in most of the 62 plots that Dale and her team are studying. Alder is a nitrogen fixer and provides valuable nutrients to the soil, fostering growth of conifer seeds blown on ...
Alnus rhombifolia is a medium-sized deciduous tree growing to 15–25 metres (49–82 ft) (rarely to 35 metres (115 ft)) tall, with pale gray bark, smooth on young trees, becoming scaly on old trees.
It is a medium-sized tree growing up to 25 m (80 feet) tall [8] (exceptionally to 28 m or 90 feet), with a trunk up to 70–100 centimetres (30–40 in) in diameter.. The leaves are deciduous but with a very long season in leaf, from April to December in the Northern Hemisphere; they are alternate, ovate or circular-ovate shaped, [9] cordate at base, [9] rich glossy green, 5–12 cm (2– 4 ...
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