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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.
The common hazel (Corylus avellana) and the filbert (Corylus maxima) are important orchard plants, grown for their edible nuts. The other genera include a number of popular ornamental trees , widely planted in parks and large gardens; several of the birches are particularly valued for their smooth, brightly coloured bark .
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 ).
Many of these plants are used intentionally as psychoactive drugs, for medicinal, religious, and/or recreational purposes. Some have been used ritually as entheogens for millennia. [1] [2] The plants are listed according to the specific psychoactive chemical substances they contain; many contain multiple known psychoactive compounds.
Infusions are hot water extracts of herbs, such as chamomile or mint, through steeping. Decoctions are the long-term boiled extracts, usually of harder substances like roots or bark. Maceration is the cold infusion of plants with high mucilage-content, such as sage or thyme. To make macerates, plants are chopped and added to cold water.