Duckweed

Duckweed
Lesser duckweed ( Lemna minor )
Systematics
Class : Bedecktsamer (Magnoliopsida) Monocots Order : Frog-spoon-like (Alismatales) Family : Arum family (Araceae) Subfamily : Duckweed family (Lemnoideae) Genre : Duckweed
Scientific name
Lemna
L.

The duckweed ( Lemna ) is a genus in the family Araceae (Araceae).

features

On the foliage members there are two lateral, rearward-facing columns from which the lateral rungs emerge. The links each have a root. Middle nerves are present, lateral nerves are present or absent. The roots do not have a leading cord. The root cap is rounded or pointed. The ovary has one or more solid seeds. The seeds are ribbed.

Occurrence

The genus is distributed worldwide, with the exception of arctic and sub-arctic regions.

Systematics

Hunchback duckweed ( Lemna gibba )

Duckweed society with Spirodela polyrhiza , Lemna minor and Wolffia arrhiza

According to the Flora of Pakistan, the genus includes around 15 species, the Flora of North America indicates a species number of 13.

There are originally 3 species native to Central Europe:

• Hunchback duckweed ( Lemna gibba L .; Syn .: Lemna parodiana Giardelli )
• Small duckweed ( Lemna minor L. )
• Trifold duckweed ( Lemna trisulca L. )

Other types:

• Leaning duckweed ( Lemna aequinoctialis Welwitsch ), native to the tropics and subtropics
• Lemna disperma Hegelm. , Home: Australia and New Zealand
• Lemna japonica Landolt , home: Russian East Asia to Japan and Korea
• Dainty duckweed ( Lemna minuta Kunth ), home: America
• Lemna obscura (Austin) Daubs : The home is the USA to Mexico and the Bahamas as well as Colombia to Ecuador.
• Lemna perpusilla Torrey : The home is Canada and the USA.
• Lemna tenera Kurz , home: Indochina to Northern Australia
• Red duckweed ( Lemna turionifera Landolt ), home: Europe to Korea and North America
• Lemna valdiviana Philippi , home: America
• Lemna yungensis Landolt , home: Bolivia.

Of these species, the crooked duckweed ( Lemna aequinoctialis Welwitsch ), the petite duckweed ( Lemna minuta Kunth ) and the red duckweed ( Lemna turionifera Landolt ) also appear as neophytes in Central Europe.

use

Lemna species are also used in aquaristics.

supporting documents

1. ↑ ^{a b} Gustav Hegi : duckweed . In: Illustrated flora of Central Europe . Part 2. JF Lehmanns Verlag, Munich 1926, p. 140 .
2. ↑ ^{a b c} Elias Landolt : Lemnaceae : Lemna , pp. 146-149 - same text online as the printed work , In: Flora of North America Editorial Committee (editor): Flora of North America North of Mexico , Volume 22 - Magnoliophyta: Alismatidae, Arecidae, Commelinidae (in part), and Zingiberidae , Oxford University Press, New York and Oxford 2000. ISBN 0-19-513729-9
3. ↑ ^{a b} Rizwan Y. Hashmi & Saood Omer: In: Flora of Pakistan , ( Lemna - online )
4. ↑ Lemna in the Bolivia checklist - online.
5. ↑ ^{a b c d e f g h i j} Rafaël Govaerts (Ed.): Lemna. In: World Checklist of Selected Plant Families (WCSP) - The Board of Trustees of the Royal Botanic Gardens, Kew . Retrieved August 18, 2014.
6. ↑ Henning Haeupler , Thomas Muer: picture atlas of the fern and flowering plants of Germany (= The fern and flowering plants of Germany. Volume 2). Published by the Federal Agency for Nature Conservation. Ulmer, Stuttgart 2000, ISBN 3-8001-3364-4 .
7. ↑ Christel Kasselmann : aquarium plants. Ulmer Verlag, Stuttgart 1995; 2nd, revised and expanded edition 1999, ISBN 3-8001-7454-5 , pp. 327–329.

Web links

Commons : Lemna  - album with pictures, videos and audio files