Vegetation Science Group

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

Vegetation of the Czech Republic

Association VAC01
Hydrocharitetum morsus-ranae van Langendonck 1935

Hydrocharitetum morsus-ranae

Photo on botanickafotogalerie.cz

This vegetation type, dominated by Hydrocharis morsus-ranae, occurs in shallow water bodies with mesotrophic to naturally eutrophic, still or slow-moving water such as that of oxbows, alluvial pools, fishpond margins, flooded sand pits in an advanced stage of terrestrialization, or channels. It is found in lowlands and colline areas of the Czech Republic, most frequently in the floodplains of large lowland rivers, such as the lower Vltava, middle Labe, lower Dyje and lower Morava.

Orig. (van Langendonck 1935): Association à Hydrocharis morsus-ranae

Syn: Hydrocharito-Stratiotetum Kruseman et Vlieger 1937 p. p., Hydrocharito morsus-ranae-Nymphoidetum peltatae Slavnić 1956, Lemno minoris-Hydrocharitetum morsus-ranae Passarge 1978

Diagnostic species: Ceratophyllum demersum, Hydrocharis morsus-ranae, Lemna trisulca. Spirodela polyrhiza

Constant species: Hydrocharis morsus-ranae, Lemna minor. Spirodela polyrhiza

Dominant species: Ceratophyllum demersum, Hydrocharis morsus-ranae, Lemna minor, Spirodela polyrhiza

Formal definition: Hydrocharis morsus-ranae cover > 25 % NOT Ceratophyllum demersum cover > 50 % NOT Equisetum fluviatile cover > 25 % NOT Hottonia palustris cover > 25 % NOT Phragmites australis cover > 25 % NOT Schoenoplectus lacustris cover > 25 % NOT Sparganium emersum cover > 25 % NOT Stratiotes aloides cover > 5 % NOT Typha angustifolia cover > 25 % NOT Typha latifolia cover > 25 %

Source: Šumberová K. (2011): VAC01 Hydrocharitetum morsus-ranae van Langendonck 1935. 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. 87-89.