Hairy pondweed

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Hairy pondweed
Hairy pondweed (Potamogeton trichoides)

Hairy pondweed ( Potamogeton trichoides )

Systematics
Class : Bedecktsamer (Magnoliopsida)
Monocots
Order : Frog-spoon-like (Alismatales)
Family : Pondweed family (Potamogetonaceae)
Genre : Spawn herbs ( Potamogeton )
Type : Hairy pondweed
Scientific name
Potamogeton trichoides
Cham. & Schltdl.

The Haarblättrige pondweed ( Potamogeton trichoides ), also hair-shaped pondweed called, is a species of the genus pondweed ( Potamogeton ) within the family of potamogetonaceae (Potamogetonaceae).

description

illustration

The hair-leaved pondweed is a deciduous, perennial to annual herbaceous plant that reaches heights of 30 to 250 centimeters. The rhizome is thin or completely absent. The stem is thin, thread-like, brittle and heavily branched at the top. The leaves are 0.3 to 1 millimeter wide, long and finely pointed, almost brush-shaped and three-veined, the width of the middle nerve is more than 1/3 the width of the leaf base. The lateral nerves merge well in front of the leaf tip.

The flowering period extends from June to September. The annual inflorescence contains four to eight flowers. The flowers usually contain one to rarely three ovaries .

Only one fruit develops per ear. The fruits are about three millimeters long, almost semicircular and mostly keeled on the back with bumps. The beak is barely visible.

The spindle-shaped turions are located on the leaves.

The number of chromosomes is 2n = 26.

Occurrence

The hairy pondweed is widespread in Eurasia and North Africa. The area extends from Europe to Central Asia, from the Canary Islands to North Africa and from Uganda to South Africa. In Europe the main area of ​​distribution is in Central Europe , northwards there are few occurrences up to about 60 ° north latitude. The hair-leaved pondweed occurs only rarely in the Mediterranean region . In Central Europe, the hair-leaved pondweed occurs rarely in eastern Schleswig-Holstein , Mecklenburg-Western Pomerania and Brandenburg ; in the foothills of the Alps and in the Alps , in the Swiss Plateau and in the Swiss Jura it occurs very rarely, and it is absent there in large areas; in the lakes of the Engadine it still occurs at altitudes of around 1700 meters.

The hair-leaved pondweed thrives best in low-calcium , moderately acidic, cool, oxygen-rich waters . In Central Europe, it populates drainage ditches in moors and occasionally also deep ponds , which receive an inflow from moors, but also deep brooks fed by groundwater . The hair-leaved pondweed occurs somewhat more frequently in the lowlands of Central Europe due to its location requirements . It can withstand slightly brackish water . Therefore it can thrive even in the estuary of the rivers. However, in the 20th century it lost most of its previously known locations. It occurs particularly in the Potamogetonetum trichoidis society from the Potamogetonion association.

literature

  • Otto Schmeil , Jost Fitschen (greeting), Siegmund Seybold: The flora of Germany and the neighboring countries. A book for identifying all wild and frequently cultivated vascular plants. 95th completely revised u. exp. Edition. Quelle & Meyer, Wiebelsheim 2011, ISBN 978-3-494-01498-2 .
  • Rothmaler : Excursion flora from Germany, vascular plants: basic volume. 20th edition, 2011, Spektrum Verlag Heidelberg, ISBN 978-3-8274-1606-3
  • Henning Haeupler , Thomas Muer: picture atlas of the fern and flowering plants of Germany (= the fern and flowering plants of Germany. Volume 2). 2nd, corrected and enlarged edition. Published by the Federal Agency for Nature Conservation. Ulmer, Stuttgart 2007, ISBN 978-3-8001-4990-2 .
  • Oskar Sebald, Siegmund Seybold, Georg Philippi, Arno Wörz (eds.): The fern and flowering plants of Baden-Württemberg. Volume 7: Special part (Spermatophyta, subclasses Alismatidae, Liliidae Part 1, Commelinidae Part 1): Butomaceae to Poaceae. Eugen Ulmer, Stuttgart 1998, ISBN 3-8001-3316-4 .
  • Dietmar Aichele, Heinz-Werner Schwegler: The flowering plants of Central Europe. Franckh-Kosmos-Verlag, 2nd revised edition 1994, 2000, Volume 5, ISBN 3-440-08048-X

Individual evidence

  1. ↑ a b Erich Oberdorfer : Plant-sociological excursion flora for Germany and neighboring areas. 8th edition. Page 104. Stuttgart, Verlag Eugen Ulmer, 2001. ISBN 3-8001-3131-5
  2. ↑ Rafaël Govaerts (ed.): Potamogeton trichoides. In: World Checklist of Selected Plant Families (WCSP) - The Board of Trustees of the Royal Botanic Gardens, Kew . Retrieved August 14, 2016.

Web links

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