Product Description
Alder Current Pao Canvas Wall Pictures
Alder Current Pao Canvas Wall Pictures
Alder is the common name of a genus of flowering plants belonging to the birch family Betulaceae. The genus comprises about 30 species 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 and the northern Andes. Familiar North American alders are the red alder, a tall tree whose leaves have rusty hairs on their lower surfaces. Alders are practically immune to diseases other than fungal attacks. Usually propagated by seed, they may also be cultivated from cuttings or suckers.
An alder may be distinguished from a birch by its usually stalked winter buds and by cones that remain on the branches after the small, winged nutlets are released. The scaly bark is grayish brown in some species and almost white in others. The oval leaves are alternate, serrate, and often shallowly lobed; sticky on unfolding but glossy when mature, they fall without changing color. Male and female flowers are borne in separate catkins on the same tree; they form during the summer and usually blossom the following spring before the leaves open. The largest species are red alder on the west coast of North America, and black alder, native to most of Europe and widely introduced elsewhere, both reaching over 30 m. By contrast, the widespread green alder is rarely more than a 5-m-tall shrub.
