Vegetation Science Group

Department of Botany and Zoology | Faculty of Science | Masaryk University

Vegetation of the Czech Republic

Association VAA04
Lemno-Spirodeletum polyrhizae Koch 1954

Lemno-Spirodeletum polyrhizae

Photo on botanickafotogalerie.cz

This vegetation type is characterized by Spirodela polyrhiza, a tiny lemnid floating on the water surface, which is frequently accompanied by Lemna minor. It occurs in different types of eutrophic to hypertrophic water bodies with still or slowly moving water, across the Czech Republic except mountain areas. In places the stands can completely cover the water surface.

Orig. (Koch 1954): Lemneto-Spirodeletum polyrrhizae .Lemna minor. L. paucicostata)

Syn.: Lemno-Spirodeletum Slavnić 1956 (fantom), Spirodeletum polyrhizae Kehlhofer ex Tüxen et Schwabe in Tüxen 1974

Diagnostic species: Lemna minor, Spirodela polyrhiza

Constant species: Lemna minor, Spirodela polyrhiza

Dominant species: Lemna minor, Spirodela polyrhiza

Formal definition: (Spirodela polyrhiza cover > 50 % OR (Lemna minor cover > 50 % AND Spirodela polyrhiza cover > 5 %) OR (Lemna minor cover > 25 % AND Spirodela polyrhiza cover > 25 %)) NOT Acorus calamus cover > 25 % NOT Alisma plantago-aquatica cover > 25 % NOT Bidens cernua cover > 25 % NOT Bolboschoenus maritimus s. l. cover > 25 % NOT Carex pseudocyperus cover > 25 % NOT Ceratophyllum demersum cover > 25 % NOT Cicuta virosa cover > 25 % NOT Elodea canadensis cover > 25 % NOT Equisetum fluviatile cover > 25 % NOT Glyceria fluitans cover > 25 % NOT Glyceria maxima cover > 25 % NOT Hydrocharis morsus-ranae cover > 25 % NOT Juncus effusus cover > 25 % NOT Leersia oryzoides cover > 25 % NOT Lemna trisulca cover > 50 % NOT Myriophyllum verticillatum cover > 25 % NOT Nuphar lutea cover > 25 % NOT Oenanthe aquatica cover > 25 % NOT Persicaria amphibia cover > 25 % NOT Potamogeton pusillus agg. cover > 25 % NOT Potamogeton natans cover > 25 % NOT Potamogeton pectinatus cover > 25 % NOT Potamogeton trichoides cover > 25 % NOT Rumex maritimus cover > 25 % NOT Sagittaria sagittifolia cover > 25 % NOT Salvinia natans cover > 5 % NOT Schoenoplectus lacustris cover > 25 % NOT Sparganium emersum cover > 25 % NOT Sparganium erectum cover > 25 % NOT Stratiotes aloides cover > 5 % NOT Typha angustifolia cover > 25 % NOT Typha latifolia cover > 25 % NOT Utricularia australis cover > 25 % NOT Wolffia arrhiza cover > 25 %

Source: Šumberová K. (2011): VAA04 Lemno-Spirodeletum polyrhizae Koch 1954. In: Chytrý M. (ed.), Vegetace České republiky. 3. Vodní a mokřadní vegetace [Vegetation of the Czech Republic 3. Aquatic and wetland vegetation]. Academia, Praha, pp. 54-57.