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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
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.
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 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).
The Betulaceae are believed to have originated at the end of the Cretaceous period (about 70 million years ago) in central China.This region at the time would have had a Mediterranean climate due to the proximity of the Tethys Sea, which covered parts of present-day Tibet and Xinjiang into the early Tertiary period.
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.
Birch bark tar use as an adhesive began in the Middle Paleolithic. Neanderthals produced tar through dry distillation of birch bark as early as 200,000 years ago. [6] A 2019 study demonstrated that birch bark tar production can be a simpler, more discoverable process by directly burning birch bark under overhanging stone surfaces in open-air conditions. [7]
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