Betula

Also known as birch, the birch genus, birch tree

A birch is a thin-leaved deciduous hardwood tree of the genus Betula (), 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. They are typically short-lived pioneer species and are widespread in the Northern Hemisphere, particularly in northern areas of temperate climates and in boreal climates. Birch wood is used for a wide range of purposes.

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Betula is a genus of deciduous hardwood trees commonly known as birches, found widely across the Northern Hemisphere in temperate and boreal climates. These trees are valued for their wood, which has many practical uses, though some of the 30 to 60 species in the genus are threatened with extinction.

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Species

FamilyBetulaceae

Native toAfghanistan, Alabama, Alaska, Albania, Alberta, Altay, Amur, Argentina South, Arizona, Arkansas, Assam, Austria

桦木属（學名：Betula）是桦木科的一个属，与壳斗科的山毛榉及栎树有很亲密的关系。主要生长在北半球温带气候。桦树，別名桦皮书，通常是灌木或中小型乔木，常见种类有白桦、红桦、黒桦等。桦树的单叶的边缘呈锯齿状，或浅裂状。它的果实是小的翅果，虽然一些品种果实上的翅不明显。桦树与桤木（赤杨，同一科的另一个属）的区别在于，与桤木的木质化的类似球果的雌性柔荑花序不同，桦树的雌性柔荑花序成熟后不会木质化并碎裂，以释放种子。文化元朝文人袁桷在《戏题桦皮》一诗中称： “ 褐裳新脱玉层层,红叶朱蕉谢不能。 ” —— 袁桷《戏题桦皮》这是一篇與植物相關的小作品。你可以通过编辑或修订扩充其内容。查论编取自“https://zh.wikipedia.org/w/index.php?title=桦木属&oldid=32666314” 分类：树桦木属落葉植物隐藏分类：本地相关图片与维基数据不同含有拉丁語的條目 Articles with attributed pull quotes 全部小作品植物小作品

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