betulaceae The plants have a greater economic value, especially birch are important, such as white birch, black birch, rough skin birch, birch leaves and other light not only the importance of the north temperate forest tree species and tree species, and is one of high-quality timber. Bark and other organizations in different cells contain large amounts of tannins (Bang acid, anthocyanin and former ellagic acid, etc.). According to flower and fruit morphology, is divided into undergraduate and birch hazel family is a family 2 family 6.
Translated by Google
No. 2
Paper birch leaves, the Rou weed male inflorescence and female flowers. Betulaceae Flowering plants, a subject, usually head into the beech (Fagales); but some experts put it into birch head (Betulales). Betulaceae with 6 genera, 120 to 150 species. Can be divided into two subfamilies ︰ birch subfamily (Betuleae), with Betula (Betula) and Alnus (Alnus); Hazel subfamily (Coryleae), with Carpinus (Carpinus), Corylus (Corylus) , iron wood is (Ostrya) and Tiger Corylus (Ostryopsis). Some of the classification system as a separate subfamily of these two subjects; 克伦基斯特 (Arthur Cronquist) recommended and widely accepted classification system also recognizes Carpinus subfamily (Carpineae) for the third sub-orders. Betula about 60 species, is the largest genus of Betulaceae. Betulaceae species distribution in the northern hemisphere's temperate and subarctic regions (in some species reach the northern boundary of the distribution of woody plants), from the Andes mountains and the tropical south to Argentina, South America. Betulaceae leaf single leaf, leaf margin serrate, alternate. Flowers unisexual, monoecious; flowers and leaves simultaneously, or the first leaves after flowering. Male flowers grow together students of Rou weed inflorescences drooping; the female students of Rou weed inflorescence is shorter, drooping or upright. Fruit is usually a small nut or a short-winged samara. Birch and alder wood more economic value. Hazel seeds edible. Birch twig extract the oil, smell and taste like wintergreen oil are used to Russian leather tanning. Many species planted for ornamental plants. The plants have a greater economic value, especially birch are important, such as white birch, black birch, rough skin birch, birch leaves and other light not only the importance of the north temperate forest tree species and tree species, and is one of high-quality timber. Bark and other organizations in different cells contain large amounts of tannins (Bang acid, anthocyanin and former ellagic acid, etc.). According to flower and fruit morphology, is divided into undergraduate and birch hazel family is a family 2 family 6.
Translated by Google
Scientific knowledge
Betulaceae (Betulaceae) dicotyledons, attached to the shell bucket head (Fagales). 6 genera, 140 species, the main producing north temperate zone. China 6 genera and 70 species, distributed in northern, central to the southwest. Tiger hazelnut is (Ostryopsis) for the Chinese specialty. Deciduous trees or shrubs. With ectomycorrhizal root. Shoots, leaves often with resin glands or glands. Leaves, alternate, and more with a heavy serrated. Stomata irregular type. Flowers unisexual same strain. Male inflorescence is drooping Rou weed flower, male flower with bud scales. Stamens 2-20 pieces. Female inflorescence is cylindrical or cone-like inflorescence Rou weed. Ovary 2 Room 2 Room or incomplete. Ovules 1-2 pieces per room, anatropous. Nuclear-type endosperm. Ear cylindrical or oval. Seeds without endosperm, cotyledons flat. Chromosome x = 8,14. Betula (Betula) hi raw speed of light, the majority of species cold, resistance to drought, infertile soil, and often the north temperate regions slash or after the destruction of natural regeneration of forest pioneer species. Common are the white birch (B.platyphylla), Betula (B.albo-sinensis), Betula (B.luminifera) and so on. Alnus (Alnus) like most kinds of wet habitats, wet areas for the river berm and important tree species. Common are alder (A.cremastogyne), South Alder (A.trabeculosa), alder (A.japonica) and so on. Tiger hazelnut (Ostryopsis davidiana) bark and leaves can be extracted tannin extract, seed oil for food and soap, sticks to the preparation of tools. Most types of soft light material for construction, furniture, matchstick and other timber; fruit order, the bark contains tannin, dye and can be used for extraction of tannin; charcoal black powder can be prepared; bee pollen is excellent.