Small knotweed
| Small knotweed | ||||||||||||
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Lesser knotweed ( Persicaria minor ) |
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| Scientific name | ||||||||||||
| Persicaria minor | ||||||||||||
| ( Huds. ) Opiz |
The Small knotweed ( Persicaria minor (Huds) Opiz. , Syn. : Polygonum minus . Huds ) is a species of the genus persicaria ( Persicaria ) in the family of Knotweed (Polygonaceae).
description
The little knotweed is an annual herbaceous plant . The prostrate to ascending stem usually reaches heights of between 15 and 30 cm. The leaves are almost attached to the stem and are linear to linear lanceolate in shape. They are mostly 3 to 8 mm wide, mostly with a rounded base, with little change in width up to the middle of the leaf. Leaf veins are usually only indistinctly present. The stipple sheaths are hairy and long ciliate (2 to 5 mm).
The false spikes usually grow upright, with the flowers being purple or white in color. The bracts are glandless. The shiny black nuts are about 1.5 to 2.5 mm long.
The flowering period extends essentially from July to October.
The number of chromosomes is 2n = 40.
Locations and distribution
The little knotweed grows on banks, ditches and damp paths. It prefers wet, nutrient-rich and lime-free soils. Its distribution area includes Europe to Central Asia, Siberia and the Far East of Russia. In Germany, the species occurs scattered throughout the area, but it is particularly present in the silicate areas. In the Alps it rises to an altitude of 750 m. The small knotweed is rare in Austria, while it can be found scattered in Switzerland. It is a character species of the Polygonetum minori-hydropiperis from the association Bidention.
literature
- Henning Haeupler , Thomas Muer: picture atlas of the fern and flowering plants of Germany (= the fern and flowering plants of Germany. Volume 2). Published by the Federal Agency for Nature Conservation. Ulmer, Stuttgart 2000, ISBN 3-8001-3364-4 .
- Wolfgang Adler, Karl Oswald, Raimund Fischer: Excursion flora of Austria. Ed .: Manfred A. Fischer . Ulmer, Stuttgart / Vienna 1994, ISBN 3-8001-3461-6 .
- August Binz , Christian Heitz: School and excursion flora for Switzerland , Schwabe & Co. AG, Basel 1986, ISBN 3-7965-0832-4
- Erich Oberdorfer : Plant-sociological excursion flora , Ulmer Verlag, Stuttgart 1990, ISBN 3-8001-3454-3
- August Garcke : Illustrierte Flora , Verlag Paul Parey, Berlin and Hamburg 1972, ISBN 3-489-68034-0
Individual evidence
- ↑ 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 338.
- ↑ Persicaria in the Germplasm Resources Information Network (GRIN), USDA , ARS , National Genetic Resources Program. National Germplasm Resources Laboratory, Beltsville, Maryland. Retrieved August 14, 2017.
Web links
- Small knotweed. In: FloraWeb.de.
- Distribution map for Germany. In: Floraweb .
- Polygonum minus Huds. In: Info Flora , the national data and information center for Swiss flora . Retrieved October 7, 2015.
- Distribution in the northern hemisphere according to: Eric Hultén , Magnus Fries: Atlas of North European vascular plants 1986, ISBN 3-87429-263-0
- Thomas Meyer: Data sheet with identification key and photos at Flora-de: Flora von Deutschland (old name of the website: Flowers in Swabia )
