Persicaria maculosa

Flea knotweed ( Persicaria maculosa )

The flea knotweed ( Persicaria maculosa ) ( syn. Polygonum persicaria L., Persicaria maculata ), or Pfirsichblättriger knotweed called, is a plant belonging to the family of the buckwheat family ( Polygonaceae ).

Dusted it is mainly by insects such as flies, Hymenoptera and Lepidoptera, but it may also self-pollination. The long-lived seeds germinate only on light and by the people, through digestion or over the water (floating seeds) spread.

Description

The flea Knotweed is an annual herbaceous plant that reaches the plant height of about 40 to 80 centimeters, rarely remains only 5 centimeters to 130 centimeters is small or large. The stems grow mostly semi - decumbent or erect, they are simple or branched, glabrous or slightly hairy. The lanceolate leaves are four to six times as long as wide, they usually have a dark spot. His Ochrea is hairy and has the upper side about 2 mm long eyelashes. The petiole is usually shorter than half the width of the associated blade. The leaf blade has at hand, never a Filzbehaarung. The flea knotweed has a branched taproot.

The cylindrically - aged men inflorescences are dichtblütig and about 10 to 45 mm ( 60 mm ) long. His reddish or green flowers are about 3 mm long and overlap half imbricate. The bracts of the flowers are provided with clear eyelashes. See the shiny fruits lens-like from, are one-sided curved or triangular and are ripe dark brown or black, and 2 to 3 mm long.

Heyday

The flea knotweed flowers from July to October.

Occurrence

He is circumpolar spread. The flea knotweed is a nutrient- demanding plant (strong nitrogen pointer ) and is therefore usually to be found in Human-influenced Ruderalstellen. So he comes to wet fields, to rubble heaps, heaps, roadsides, or river banks in Central Europe except the Alps frequently.