Potamogeton perfoliatus
By Mature pondweed ( Potamogeton perfoliatus )
The Inconsistent pondweed ( Potamogeton perfoliatus ) belongs to the family of the pondweed family ( Potamogetonaceae ). It is a rooted on a body of water immersion plant leaf.
Features
By Mature pondweed developed - depending on water depth - up to six meters long, straight, branched stems. The only submersed growing leaves are ovate - lanceolate to circular, quite large (6 to 12 inches long, 3.5 to 6 inches wide ), light to dark green, grid annoying and translucent. They are characteristically heart-shaped amplexicaul and cover each other almost like roof tiles. The type is from June to August eared, dense inflorescences with inconspicuous greenish flowers from. These ears are one to three inches long, in order to extend wind pollination out of the water and eventually bear fruit abundantly. The fruits (nuts ) are quite thick with two to three millimeters.
The chromosome number is 2n = 52
Dissemination
Potamogeton perfoliatus is widespread in temperate to cool regions of the Northern Hemisphere. In several subspecies Europe ( largely without the Mediterranean region ) populated, northern Asia and North America, and also in Australia delivers the kind of, among other things. In Central Europe, its main application area is located in the lowlands, especially in the major river valleys and, for example, in the Mecklenburg Lake District. In the Alps the Inconsistent pondweed to heights of 1680 comes, according to other data prior to 1900 in meters. In the mountains it is generally but rare.
Habitat, ecology
The species grows in stagnant and slowly flowing waters such as lakes, ditches, backwaters, canals and rivers. She prefers base-and nutrient-rich waters with humus rich mud, Mudde or sandy soil and colonized depths from 50 to 700 centimeters - often in pure stands, but also associated with other spawning herbs and other diving and floating-leaf plants. Potamogeton perfoliatus is a Ordnungscharakterart the United pondweed companies ( Potamogetonetalia ). A certain contamination and turbidity of the water will endure. In case of excessive eutrophication, but the plant disappears. Regional therefore she stands on some Red List.
As for some pondweed typically, the shoots die in the fall and the nature survives with the help of previously formed winter buds, which detach and sink to the sea bottom and develop into new plants the following year. In calcareous waters the leaves are often coated with a light gray crust of carbonate of lime, the water plant fails in their assimilation from the water.
By Mature pondweed can hybridize with several other large pondweed species: The hybrids of Potamogeton perfoliatus and the mirror ends pondweed ( P. lucens ) is " Weidenblättriges pondweed ," Potamogeton × salicifolius called, the hybrids with the participation of Grasblättrigen spawning herb ( P. gramineus ) is called " Shimmering pondweed, " Potamogeton × nitens.