Trilateral duckweed
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Trilateral duckweed ( Lemna trisulca ) |
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The three- furrow duckweed ( Lemna trisulca ), named after the three nerves of its limbs, is a species from the genus of the duckweed ( Lemna ) within the family of the arum family (Araceae).
description
Duckweed usually consist of one or more apparent "leaves" ( phyllocladia ) that contain air-filled cavities. You swim with it on the surface of water. From these leaflets, a root sinks down into the water, with which nutrient salts can be absorbed. There is no division into stem and leaf.
In contrast to the other duckweed, Lemna trisulca lives mostly submerged. This applies to the larger (3–15 mm long), flat, sterile scion limbs, which are often connected crosswise with long stalks to several, are green in color and appear somewhat transparent. Only the smaller flowering stems, which float individually, overflow with purple and are curved downwards at the edges, rise to the surface. The inconspicuous flowers sit in marginal pockets.
The number of chromosomes is 2n = 40 or 44.
Occurrence
The species is distributed worldwide. As is typical for duckweed, Lemna trisulca also often forms mass populations in sunny ponds, ponds and ditches, especially in fens and floodplains . However, these are less nitrogen-polluted bodies of water than, for example, the hunchbacked duckweed , which shows highly eutrophic water conditions. Accordingly, the tri-furrow duckweed is not common everywhere and can also be absent in some regions. Typical types of accompaniment include a. Frog bite and water feather . She is a character species of the Lemnion Union.
ecology
It stores starch in autumn and then sinks to the frost-free ground for winter.
literature
- Henning Haeupler, Thomas Muer: picture atlas of the fern and flowering plants of Germany . Ed .: Federal Agency for Nature Conservation (= The fern and flowering plants of Germany . Volume 2 ). Eugen Ulmer, Stuttgart (Hohenheim) 2000, ISBN 3-8001-3364-4 .
- Elfrunde Wendelberger: Planting the wetlands (= BLV intensive guide ). blv, Munich 1986, ISBN 3-405-12967-2 .
Individual evidence
- ↑ Christel Kasselmann : aquarium plants. Ulmer Verlag, Stuttgart 1995; 2nd, revised and expanded edition 1999, ISBN 3-8001-7454-5 , p. 329.
- ↑ a b 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. 119 .
Web links
- Trilateral duckweed. In: FloraWeb.de.
- Trilateral duckweed . In: BiolFlor, the database of biological-ecological characteristics of the flora of Germany.
- Profile and distribution map for Bavaria . In: Botanical Information Hub of Bavaria .
- Distribution in the Netherlands [1] (Dutch)
- Lemna trisulca L. In: Info Flora , the national data and information center for Swiss flora .
- Distribution in the northern hemisphere from: Eric Hultén, Magnus Fries: Atlas of North European vascular plants. 1986, ISBN 3-87429-263-0 at Den virtuella floran. (swed.)
- Thomas Meyer: Data sheet with identification key and photos at Flora-de: Flora von Deutschland (old name of the website: Flowers in Swabia )
- Lemna trisulca inthe IUCN 2013 Red List of Threatened Species . Posted by: X. Zhuang, 2010. Retrieved January 8, 2014.
