Pike blue willow
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Pike blue willow ( Salix caesia ) |
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The Hecht Blue Willow or Blue Green willow ( Salix caesia ) is a plant from the genus of willow ( Salix ) within the family of the pasture plants (Salicaceae). It is widespread mainly in Asia.
description
Vegetative characteristics
The pike-blue willow is a densely branched dwarf shrub that reaches heights of up to 70 centimeters. The bark of young twigs is reddish-brown or reddish-black and sometimes silky hairy; later the bark of the branches is bare, brown and shiny.
The alternate leaves arranged on the branches are divided into a petiole and a leaf blade. The petiole is 1 to 3 millimeters long. The simple leaf blade is 0.5 to 3 centimeters long and 0.3 to 1 centimeter wide, elliptical to obovate, with a pointed, rarely blunt upper end and a wedge-shaped base . The leaf blade, bare on both sides, is dark green on top and bluish green on the underside. The leaf margin is almost smooth. The stipules are usually small.
Generative characteristics
The flowering period begins in May. The pike blue willow is dioeciously separated sex ( diocesan ). Kittens are formed as inflorescences . The sitting kittens are elongated with a length of 1 to 2 centimeters. The bracts are light brown, weak and hairy. The male flowers contain two stamens , the stamens are partially fused, the anthers dark blue-violet. In the female flowers, the ovary is almost sessile, hairy, the style relatively short and thick, the stigmas red and not divided and they have a nectar gland .
The yellowish to brown, hairy, two-lobed capsule fruits are 4 to 5 millimeters long. The seeds are surrounded by fine hairs.
The number of chromosomes is 2n = 76.
Occurrence
The main distribution areas of Salix caesia are the Chinese autonomous regions of Xinjiang and Tibet ; Central Asia : Afghanistan , Kyrgyzstan , Tajikistan , Mongolia ; West and East Siberia , Pakistan and Kashmir . The blue-green willow is very rare in Europe in Italy, France, Switzerland and Austria.
It thrives in subalpine willow bushes and is a character species of Salicetum caesio-foetidae from the association Salicion waldsteinianae.
Taxonomy
Salix caesia was first published in 1789 by Dominique Villars . Synonyms for Salix caesia Vill. are: Salix minutiflora Turczaninow ex ELWolf , Salix divergens Andersson , Salix myricaefolia Andersson .
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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 .
Individual evidence
- ↑ a b c d e Cheng-fu Fang, Shi-dong Zhao, Alexei K. Skvortsov: Salix. Salix caesia , p. 262 - online with the same text as the printed work , In: Wu Zheng-yi, Peter H. Raven (Ed.): Flora of China. Volume 4: Cycadaceae through Fagaceae , Science Press and Missouri Botanical Garden Press, Beijing and St. Louis 1999, ISBN 0-915279-70-3 .
- ↑ a b c d e Description in the Flora of Pakistan . (English)
- ↑ 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 , p. 309.
- ^ Salix caesia at Tropicos.org. Missouri Botanical Garden, St. Louis, accessed October 4, 2015.
Web links
- Salix caesia Vill., Blue-green willow. In: FloraWeb.de.
- Profile and distribution map for Bavaria . In: Botanical Information Hub of Bavaria .
- Salix caesia Vill. In: Info Flora , the national data and information center for Swiss flora . Retrieved October 3, 2015.
- Thomas Meyer: Data sheet with identification key and photos at Flora-de: Flora von Deutschland (old name of the website: Flowers in Swabia ).
- Michael Hassler, Bernd Schmitt: data sheet at Flora von Deutschland - a picture database , version 2.92.