Vegetation Science Group

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

Vegetation of the Czech Republic

Alliance VAC
Hydrocharition morsus-ranae (Passarge 1964) Westhoff et den Held 1969

This alliance includes vegetation of free-floating macrophytes, which are much larger than those dominating in the other alliances of the class Lemnetea. It occurs in shallow water bodies in an advanced stage of terrestrialization. Due to limited incidence of floods in the floodplains of regulated rivers, shallow alluvial water bodies dry out or terrestrialize quickly, and some associations of this alliance are in decline.

Orig. (Westhoff & den Held 1969): Hydrocharition (Vierhapper) Rübel 1933 em. Passarge 1964 (Hydrocharis morsus-ranae)

Syn.: Hydrocharition morsus-ranae Rübel 1933 (§ 2b, nomen nudum), Eu-Hydrocharition Passarge 1964 (§ 34b)

Diagnostic species: Ceratophyllum demersum, C. submersum. Hydrocharis morsus-ranae. Lemna minor. L. trisulca. Spirodela polyrhiza

Constant species: Ceratophyllum demersum. Lemna minor. Spirodela polyrhiza

Source: Šumberová K. (2011): VAC Hydrocharition morsus-ranae (Passarge 1964) Westhoff et den Held 1969. In: Chytrý M. (ed.), Vegetace České republiky. 3. Vodní a mokřadní vegetace [Vegetation of the Czech Republic 3. Aquatic and wetland vegetation]. Academia, Praha, p. 86.