American shrub birch

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American shrub birch
leaves

leaves

Systematics
Rosids
Eurosiden I
Order : Beech-like (Fagales)
Family : Birch family (Betulaceae)
Genre : Birch trees ( betula )
Type : American shrub birch
Scientific name
Betula pumila
L.

The American shrub birch ( Betula pumila ) is a small shrub from the kind of birches in the family of birch family (Betulaceae). The distribution area is in Canada and the USA .

description

The American shrub birch is a 3 meter high shrub with dark red-brown, smooth bark, light cork pores and dense, felty, non-warty shoots. The leaves are elliptical to obovate, 2.5 to 5 inches long and 1 to 5 inches wide, blunt with a rounded or wide wedge-shaped base and a roughly serrated edge. The upper side of the leaf is more or less hairy, the underside whitish and mostly densely hairy, but often finally bald. 4 to 6 pairs of nerves are formed per leaf. The petiole is about 2 to 3 millimeters long. The female inflorescences are upright, 1.5 to 2.5 centimeters long, cylindrical, stalked catkins . The middle lobes of the fruit scales are longer than the side lobes. The fruits are wing nuts with slightly narrower wings than the body.

The number of chromosomes is .

Distribution and ecology

The distribution area is in Canada and the USA. There it grows in swamp forests, on damp and wet meadows and swamp locations in sunny, cool locations.

American shrub birch ( Betula pumila )

Systematics and research history

The American shrub birch ( Betula pumila ) is a kind of the genus of birch ( Betula ) in the family of birch family (Betulaceae). It was first described in 1767 by Carl von Linné in the Mantissa Plantarum. Generum Editionis VI et specierum Editionis II. Some authors two are varieties distinguished, next to the south settled typical variety Betula pumila var. Pumila with mostly hairy and glandular loose sheets, the north being moved variety Betula pumila var. Glandulifera usually less hairy and glandular leaves .

use

The species is rarely used.

proof

literature

  • Andreas Roloff , Andreas Bärtels: Flora of the woods. Purpose, properties and use. With a winter key from Bernd Schulz. 3rd, corrected edition. Eugen Ulmer, Stuttgart (Hohenheim) 2008, ISBN 978-3-8001-5614-6 , p. 142.

Individual evidence

  1. ↑ German name after Roloff et al .: Flora der Gehölze , p. 142
  2. ↑ a b c Roloff et al .: Flora of the Woods , p. 142
  3. ↑ a b Betula pumila. In: Flora of North America Vol. 3. www.eFloras.org, accessed December 28, 2011 .
  4. ↑ a b Betula medwediewii. In: Germplasm Resources Information Network (GRIN). United States Department of Agriculture, accessed December 28, 2011 .

Web links

Commons : American Birch Tree ( Betula pumila )  - Collection of images, videos and audio files