Multi-rooted pond lens

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Multi-rooted pond lens
Multi-rooted pond lentil (Spirodela polyrhiza)

Multi-rooted pond lentil ( Spirodela polyrhiza )

Systematics
Monocots
Order : Frog-spoon-like (Alismatales)
Family : Arum family (Araceae)
Subfamily : Duckweed family (Lemnoideae)
Genre : Pond lentils ( Spirodela )
Type : Multi-rooted pond lens
Scientific name
Spirodela polyrhiza
( L. ) Schleid.

The multi-rooted pond lentil ( Spirodela polyrhiza , Syn .: Lemna polyrhiza L.) is a species from the genus pond lentils ( Spirodela ) in the family of the arum plants (Araceae).

features

Purple underside with root threads
Scion links with turions

The multi-rooted pond lens is a freely floating floating leaf plant. Their shoot members are 4 to 7 (rarely 1.5 to 10) millimeters long, round to obovate and flat on both sides. The underside is mostly dark purple in color, the upper side is green to red. There are usually 8, rarely 3 to 16 roots per branch. 1 to 3 (rarely up to 5) branches are connected. It forms olive, kidney-shaped, 2 to 3 millimeter wide turions . Compared to the closely related duckweed ( Lemna sp.), The pond lens is larger, more rounded and more rooted.

The number of chromosomes is 2n = 40.

The flowering period is believed to be from June to August. So far, no flowering plants are known from Germany or France.

The species is distributed by water birds ( hydroepizoochory ) and by water dispersal ( hydrochory ).

Occurrence

The species is distributed worldwide. The multi-rooted pond lentil is also widespread and quite common in Germany, but only scattered in West and Central Thuringia, Saxony-Anhalt and the mountainous region. The species inhabits shallow, eutrophic, stagnant and slowly flowing waters up to 150 centimeters deep. It is only slightly tolerant of salt. Spirodela polyrhiza is a characteristic of the Lemno-Spirodeletum association from the Lemnion minoris association . In the Allgäu, it rises in Weidensee near Remnatsried near Stötten am Auerberg in Bavaria up to 810 meters above sea level.

The species can be cultivated in the aquarium.

supporting documents

  • Eckehart J. Jäger, Klaus Werner (Ed.): Excursion flora from Germany . Founded by Werner Rothmaler. 10th edited edition. tape 4 : Vascular Plants: Critical Volume . Elsevier, Spektrum Akademischer Verlag, Munich / Heidelberg 2005, ISBN 3-8274-1496-2 .
  • Multi-rooted pond lens at floraweb.de , accessed on August 9, 2009

Individual evidence

  1. ↑ a b c 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 .
  2. ↑ Erhard Dörr, Wolfgang Lippert : Flora of the Allgäu and its surroundings. Volume 1, IHW, Eching 2001, ISBN 3-930167-50-6 , p. 201.
  3. ↑ Christel Kasselmann : aquarium plants. Ulmer Verlag, Stuttgart 1995; 2nd, revised and expanded edition 1999, ISBN 3-8001-7454-5 , p. 424.

Web links

Commons : Multi-rooted pond lentil ( Spirodela polyrrhiza )  - Collection of images, videos and audio files