Potamogeton polygonifolius

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Knotweed pondweed ( Potamogeton polygonifolius )

The knotweed pondweed ( Potamogeton polygonifolius ) is a perennial member of the family of the pondweed family ( Potamogetonaceae ).

Description

The knotweed pondweed reaches a height from 0.10 to 0.60 m. The stem is only slightly branched.

The floating leaves are up to 9 cm long and 4 cm wide, ovate to lanceolate, narrowed at the base or slightly heart-shaped, sometimes with a slight fold. The petiole is widened without flexible joint. Midrib thick at the lower side of blade, spongy. The dive leaves at flowering time are still present, lanceolate, obtuse, thin and narrowed into a long stalk. Means of strips can be seen clearly. The rötlichenStolonen are up to about 10 cm long, divided into short and crawling in the soil and are about as thick as the stem with 2 mm.

The knotweed Laickraut blooms in the months of May to October. The flower Nourish has a loose and narrow structure, the ears of corn stalk is thin. The fruits are 1.5-2.5 mm long nuts, which are keeled blunt on the back.

Popularization

Europe, North Africa rarely in the northern coastal regions. In Europe, the closed range extends northward to about 60 ° north latitude, isolated reserves are found in Norway to 68 ° north latitude, east of the rich deposits up to about 20 ° east longitude, wherein the plant in eastern Central Europe is very rare.

Locations

The knotweed pondweed preferably lime-free, moderately acidic peat soils and therefore occurs only in bog drainage ditches, Torfstichen, mud pools and deeper hollows, where the ground a little sand should be added. It tolerates temporary drying times and then forms landforms from.

The knotweed pondweed forms the own plant community hype Rico Potametum oblongi or grows in beach Nerd societies, but also in poorer water lily stocks and in stocks of small water hose.

In the north-western Central Europe it is rare, otherwise it occurs only sporadically. In Germany it is common in the north-western plains, and along the Baltic coast. Otherwise, one finds ( south to the Palatinate ) only in the Rhine region and in the lower Main area, some scattered occurrences.

The species is critically endangered and many places in decline.