| Betula pubescens | ||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 |
||||||||||||||||
| Scientific classification | ||||||||||||||||
|
||||||||||||||||
| Binomial name | ||||||||||||||||
| Betula pubescens Ehrh. |
Betula pubescens (Downy Birch; also known as White Birch, European White Birch or Hairy Birch) is a species of birch, native and abundant throughout northern Europe, Iceland, northern Asia and also Greenland[1]. Jakob Friedrich Ehrhart (1742-1795 was a German Botanist, a pupil of Carolus Linnaeus at Uppsala University, and later Director of the Birch is the name of any Tree of the genus Betula ( Bé-tu-la) in the family Betulaceae, closely related to the Iceland, officially the Republic of Iceland ( ( Ísland or Lýðveldið Ísland ( Greenland (Kalaallit Nunaat meaning "Land of the Greenlanders" Grønland is a self-governing Danish Province located between the
It is a deciduous tree growing to 10-20 m tall (rarely to 27 m), with a slender crown and a trunk up to 70 cm (exceptionally 1 m) diameter, with smooth but dull grey-white bark finely marked with dark horizontal lenticels. Botany Autumn leaf color. See --> In Botany and Horticulture, deciduous Plants, including A tree is a perennial Woody plant. It is most often defined as a woody plant that has many secondary branches supported clear of the ground on a single main stem or Bark, also known as periderm is the outermost layer of stems and Roots of Woody plants such as Trees It overlays the Wood and consists A lenticel is a spongy area present in the cork surfaces of the stems roots and other parts of vascular plants The shoots are grey-brown and finely downy. The leaves are ovate-acute, 2-5 cm long and 1. In Botany, a leaf is an above-ground Plant organ specialized for Photosynthesis. 5-4. 5 cm broad, with a finely serrated margin. The flowers are wind pollinated catkins, produced in early spring before the leaves. A flower, also known as a bloom or Blossom, is the reproductive structure found in Flowering plants (plants of the division Magnoliophyta, also A catkin or ament is a slim cylindrical flower cluster with inconspicuous or no petals usually Wind - pollinated ( anemophilous) but sometimes The fruit is a pendulous cylindrical aggregate 1-4 cm long and 5-7 mm diameter, which disintegrates at maturity releasing the individual seeds; these are 2 mm long with two small wings along the side. The term fruit has different meanings dependent on context and the term is not synonymous in Food preparation and Biology.
It is closely related to, and often confused with, the Silver Birch (B. pendula). Many North American texts treat the two species as conspecific (and cause confusion by combining the Downy Birch's alternative vernacular name 'White Birch', with the scientific name B. pendula of the other species), but they are regarded as distinct species throughout Europe. Downy Birch can be distinguished from Silver Birch in having smooth, downy shoots, which are hairless and warty in Silver Birch. The bark of the Downy Birch is a dull greyish white, whereas the Silver Birch has striking white papery bark with black fissures. The leaf margins also differ, finely serrated in Downy Birch, coarsely double-toothed in Silver Birch. They are also distinguished cytologically, Silver Birch being diploid (with two sets of chromosomes), whereas Downy Birch is tetraploid (four sets of chromosomes). "Haplo" redirects here For the fictional character see The Death Gate Cycle. Polyploidy occurs in cells and Organisms when there are more than two homologous sets of Chromosomes. The two have differences in habitat requirements, with Downy Birch more common on wet, poorly drained sites such as clays and peat bogs, and Silver Birch found mainly on dry, sandy soils. A habitat (which is Latin for "it inhabits" is an Ecological or environmental area that is inhabited by a particular Species.
Downy Birch extends farther north into the Arctic than any other broadleaf tree. The Arctic is the Region around the Earth 's North Pole, opposite the Antarctic region around the South Pole. The flowering plants or angiosperms ( Angiospermae or Magnoliophyta) are the most widespread group These subarctic populations are usually small and very contorted, and are often distinguished as Arctic Downy Birch, Betula pubescens subsp. tortuosa. This subspecies is notable as being the only tree native to Iceland and to Greenland, where large specimens can reach 5-6 m tall. Iceland, officially the Republic of Iceland ( ( Ísland or Lýðveldið Ísland ( Greenland (Kalaallit Nunaat meaning "Land of the Greenlanders" Grønland is a self-governing Danish Province located between the
References
- Flora Europaea: Betula pubescens
- Bean, W. J. (1976). Trees and shrubs hardy in the British Isles 8th ed. , revised. John Murray.
- Rushforth, K. (1999). Trees of Britain and Europe. HarperCollins ISBN 0-00-220013-9.
Dapyx Software network: MP3 Explorer | Ebook Manager | Zenithic