Pale willow

from Wikipedia, the free encyclopedia
Pale willow
Pale Willow (Salix starkeana), illustration, above

Pale Willow ( Salix starkeana ), illustration, above

Systematics
Rosids
Eurosiden I
Order : Malpighiales (Malpighiales)
Family : Willow family (Salicaceae)
Genre : Willows ( Salix )
Type : Pale willow
Scientific name
Salix starkeana
Willd.

The pale willow ( Salix starkeana ) is a small, prostrate shrub from the genus of the willow ( Salix ) with red-brown to purple-red, bare branches and olive-green leaf tops. The natural range of the species is in Europe and in northern Asia.

description

The pale willow is up to 1 meter high, prostrate to arching ascending shrub with thin, red-brown to purple-red, bare branches. Young shoots are initially hairy and shed later. The leaves are broadly elliptic to semi-kidney-shaped stipules . The petiole is about 5 millimeters long. The leaf blade is 5 to 7 centimeters long, 1.5 to 2 centimeters wide, broadly lanceolate to ovoid or obovate, suddenly pointed, with a narrowed base and a glandular serrate margin. The upper side of the leaf is initially slightly hairy, later balding, weakly shiny, olive-green and nervous. The underside is bare and deep to blue-green. Six to eight pairs of nerves are formed.

The inflorescences are 1 to 3 centimeters long, elliptical catkins on a 1 centimeter long stalk covered with leaves. The bracts are yellowish or brownish, glabrous and long bearded only on the edge. A nectar gland is formed per flower. Male flowers have two almost bare stamens . The ovary of female flowers is long-stalked and densely hairy. The stylus is formed clearly, the scar is divided gabelig. The pale willow flowers from March to April at the same time as the leaves shoot.

The number of chromosomes is 2n = 38 or 44.

Occurrence and location requirements

The natural distribution area extends from Northern Europe (Finland, Norway, Sweden) through Central Europe (Germany, Poland, Czech Republic, Slovakia) to Romania and the Far East of Russia ( Siberia , Primorsky Region ). In Germany there are stocks in Bavaria and Baden-Württemberg , with the populations in Bavaria listed as threatened with extinction and in Baden-Württemberg as critically endangered. The pale willow grows in bogs and swamps on boggy and wet-peat soils in sunny to light-shady locations. The distribution area is assigned to winter hardiness zone 5a with mean annual minimum temperatures of −28.8 to −26.0 ° C (−20 to −15 ° F).

The pale willow thrives in Central Europe in cold winter, frost-rich areas. It is a character species of the Polygono-viviparo-Nestedum sagittalis from the Violion caninae association, but also occurs in the Molinion association or in the Betulo-Salicetum repentis.

Systematics

The pale willow ( Salix starkeana ) is a species from the genus of the willow ( Salix ) in the family of the willow family (Salicaceae). It was scientifically described for the first time in 1806 by Carl Ludwig Willdenow . The generic name Salix comes from Latin and was already used by the Romans for various types of willow. A synonym of the species is Salix livida Wahlenb.

use

The pale willow is very 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 , pp. 588-589.
  • Jost Fitschen: Woody flora . 12th, revised and expanded edition. Quelle & Meyer, Wiebelsheim 2007, ISBN 3-494-01422-1 , p. 761 .
  • Helmut Genaust: Etymological dictionary of botanical plant names. 3rd, completely revised and expanded edition. Nikol, Hamburg 2005, ISBN 3-937872-16-7 (reprint from 1996).

Individual evidence

  1. ↑ German name after Roloff et al .: Flora der Gehölze , p. 588 and Fitschen: Gehölzflora , p. 761
  2. ↑ a b c d Roloff et al .: Flora of the Woods , pp. 588–589
  3. ↑ a b c Fitschen: Gehölzflora , p. 761
  4. ↑ a b Erich Oberdorfer : Plant-sociological excursion flora for Germany and neighboring areas . 8th edition. Verlag Eugen Ulmer, Stuttgart 2001, ISBN 3-8001-3131-5 . Page 307.
  5. ↑ a b c Salix starkeana . In: Germplasm Resources Information Network (GRIN). United States Department of Agriculture, accessed August 6, 2012 .
  6. ^ Salix starkeana . In: FloraWeb. Federal Agency for Nature Conservation, accessed on August 12, 2012 .
  7. ↑ Exactly: Etymological Dictionary of Botanical Plant Names , p. 552

Web links