Different-leaved milfoil
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Diverse milfoil ( Myriophyllum heterophyllum ) |
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| Myriophyllum heterophyllum | ||||||||||||
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The thousand-leaf milfoil ( Myriophyllum heterophyllum ) is a species of the thousand-leaf genus ( Myriophyllum ) in the thousand-leaf family (Haloragaceae). This species is rarely used as an ornamental plant in garden ponds.
features
The different-leaved thousand-leaf is a perennial herbaceous plant that reaches stature lengths of 30 to 250 centimeters. It grows as an underwater plant (hydrophyte). The leaf whorls are four to six fold. The shape of the leaf blades depends on the water temperature. At temperatures of 12 to 16 ° C pinnate leaves develop with 5 to 20 thread-like and more or less alternate sections, from 20 to 25 ° C undivided, serrated leaves develop. The annual inflorescence is 3 to 35 centimeters long.
Most of the flowers are hermaphroditic. They are found individually in the leaf axils of incised or toothed, shiny bracts in spike-like inflorescences . The bracts are much longer than the flowers. There are four stamens . The scars are red. The bracts are flat, lanceolate to oblong or obverse-shaped, entire or sharply serrated. The partial fruits are often two-edged and bumpy on the back.
The flowering period extends from June to September.
Occurrence
The species occurs in warm to temperate eastern North America in nutrient-rich waters. In Germany and many other parts of the world, the various-leaved thousand-leaf is feral as a neophyte . It is naturalized in Central Europe in societies of the association Potamogetonion in standing meso-eutrophic waters.
swell
literature
- Eckehart J. Jäger, Friedrich Ebel, Peter Hanelt, Gerd K. Müller (eds.): Rothmaler excursion flora from Germany. Volume 5: Herbaceous ornamental and useful plants. Spectrum Academic Publishing House, Berlin Heidelberg 2008, ISBN 978-3-8274-0918-8 .
Individual evidence
- ^ Erich Oberdorfer : Plant-sociological excursion flora for Germany and neighboring areas . With the collaboration of Angelika Schwabe and Theo Müller. 8th, heavily revised and expanded edition. Eugen Ulmer, Stuttgart (Hohenheim) 2001, ISBN 3-8001-3131-5 , pp. 692 .
Web links
- Different-leaved milfoil. In: FloraWeb.de.
- Distribution map for Germany. In: Floraweb .
- Distribution in the Netherlands [1] (Dutch)