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Betula platyphylla, the Asian white birch [1] or Japanese white birch, [2] is a tree species in the family Betulaceae. [1] [3] It can be found in subarctic and temperate Asia in Japan, China, Korea, Mongolia, the Russian Far East, and Siberia. It can grow to be 30 metres (100 feet) tall. [3]
Bark on twigs without methyl salicylate. Female catkins pendulous. Diploid (2n = 28). Betula cordifolia - Heart-leaf birch or mountain paper birch; Betula pendula - Silver birch; Betula mandschurica - Manchurian birch Betula mandschurica var. japonica - Japanese birch; Betula neoalaskana - Alaska birch or Yukon birch
A birch is a thin-leaved deciduous hardwood tree of the genus Betula (/ ˈ b ɛ tj ʊ l ə /), [2] in the family Betulaceae, which also includes alders, hazels, and hornbeams. It is closely related to the beech-oak family Fagaceae. The genus Betula contains 30 to 60 known taxa of which 11 are on the IUCN 2011 Red List of Threatened Species.
Birch bark or birchbark is the bark of several Eurasian and North American birch trees of the genus Betula. For all practical purposes, birch bark's main layers are the outer dense layer, white on the outside, and the inner porous layer . For vast majority of crafts, the outer bark is used. In many languages it has a separate name.
Betula szechuanica, the Sichuan birch or Szechuan birch, is a birch species native to Sichuan, China, conical in shape, growing to 20 meters in height, with white bark, yellow-green male catkins or green female catkins, and dark, blue-green leaves.
In the past, the family was often divided into two families, Betulaceae (Alnus, Betula) and Corylaceae (the rest). Recent treatments, including the Angiosperm Phylogeny Group, have described these two groups as subfamilies within an expanded Betulaceae: Betuloideae and Coryloideae.
Betula pendula, commonly known as silver birch, warty birch, European white birch, [2] or East Asian white birch, [3] is a species of tree in the family Betulaceae, native to Europe and parts of Asia, though in southern Europe, it is only found at higher altitudes.
Birch triterpenes, sold under the brand name Filsuvez, is an extract of birch bark used as a topical medication for the treatment of epidermolysis bullosa. [1] [3] The active ingredients are triterpenes extracted from the outer bark of silver birch (Betula pendula) and downy birch (Betula pubescens).
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