Argentine waterweed

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Argentine waterweed
Systematics
Class : Bedecktsamer (Magnoliopsida)
Monocots
Order : Frog-spoon-like (Alismatales)
Family : Frog bite family (Hydrocharitaceae)
Genre : Waterweed ( Elodea )
Type : Argentine waterweed
Scientific name
Elodea callitrichoides
( Rich. ) Casp.

The Argentine waterweed ( Elodea callitrichoides ), also known as water star waterweed , is a species of the genus waterweed ( Elodea ) in the frog-bite family (Hydrocharitaceae). It thrives submerged in water.

description

Vegetative characteristics

The Argentine waterweed is an evergreen, perennial , aquatic plant that reaches stature lengths of 10 to 200 centimeters. The dark green leaves are mostly slack and flat - not, as with other waterweed species, stiff, twisted or bent back. They are linear and long, pointed, 7.5 to 15 times as long as they are wide, and usually grow lively in threes (2–4) on flowing stems. The stem nodes are greenish.

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Generative characteristics

The Argentine waterweed is dioeciously separated sex ( diocesan ). The petals of the flowers protruding from the water are colored white and slightly longer than the sepals . Male flowers are 5.5 to 9.5 millimeters in diameter and are not detached from the stem during flowering.

The number of chromosomes is 2n = 48.

Occurrence

The Argentine waterweed thrives in stagnant and flowing waters from southern Uruguay to Argentina . It was naturalized in France and Germany in 1964 and, like the other Elodea species, is considered a neophyte in Europe . In Europe there are only male plants, so that reproduction is purely vegetative. (According to other information, only plants with female flowers occur in Germany.) The Argentine waterweed thrives in societies of the Ranunculion fluitantis association.

use

The Argentine waterweed is used in mild winter areas as an ornamental plant for garden ponds and aquariums.

literature

  • 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 .
  • Eckehart J. Jäger, Friedrich Ebel, Peter Hanelt, Gerd K. Müller (eds.): Rothmaler excursion flora from Germany. Volume 5: Herbaceous ornamental and useful plants. Spectrum Academic Publishing House, Berlin / Heidelberg 2008, ISBN 978-3-8274-0918-8

Individual evidence

  1. ↑ a b Erich Oberdorfer : Plant-sociological excursion flora for Germany and neighboring areas. 8th edition. Page 113. Stuttgart, Verlag Eugen Ulmer, 2001. ISBN 3-8001-3131-5
  2. ↑ Rafaël Govaerts (ed.): Elodea callitrichoides. In: World Checklist of Selected Plant Families (WCSP) - The Board of Trustees of the Royal Botanic Gardens, Kew . Retrieved August 21, 2016.

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