Vegetation Science Group

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

Vegetation of the Czech Republic

Class MA
Isoëto-Nano-Juncetea Br.-Bl. et Tüxen ex Br.-Bl. et al. 1952
Vegetation of annual wetland herbs

MAA Eleocharition ovatae

MAB Radiolion linoidis

MAC Verbenion supinae

The class Isoëto.Nano-Juncetea includes vegetation of low-growing annual wetland graminoids and dicot herbs. The life cycle of many of these species can last for as little as 4–6 weeks, but can be shortened or prolonged depending on water availability and temperature. Seeds of these plants are able to survive several decades in the seed bank on the bottom of water bodies. These life history characteristics enable these plants to survive in unpredictable wetland environments, which dry out in irregular intervals of a few or several years. Optimum conditions for the development of this vegetation are in places where water drops down to the level of the bottom, and then dries out slowly. After drying out, succession proceeds rapidly towards vegetation of taller annual or perennial herbs, which outcompete the low-growing annuals. This class has a broad range across Eurasia including the Mediterranean and North America. In the Czech Republic it is particularly common in fishponds.

Orig. (Braun-Blanquet et al. 1952): Isoeto-Nanojuncetea Br.-Bl. et Tx. 1943

Syn: Isoëto-Nano-Juncetea Br.-Bl. et Tüxen 1943 (§ 2b, nomen nudum), Isoëto-Nano-Juncetea Br.-Bl. et R. Tx. ex Westhoff et al. 1946 prov. (§ 3b)

Diagnostic species: Alisma plantago-aquatica, Alopecurus aequalis, Bidens radiata, B. tripartita. Callitriche palustris s. l. (predominantly C. palustris s. str.), Carex bohemica, Coleanthus subtilis. Cyperus fuscus. Elatine hydropiper. E. triandra. Eleocharis acicularis, E. ovata, Gnaphalium uliginosum, Gypsophila muralis, Juncus bufonius, Leersia oryzoides, Limosella aquatica, Oenanthe aquatica, Peplis portula, Persicaria hydropiper. P. lapathifolia. Plantago uliginosa. Potentilla supina. Ranunculus sceleratus, Rorippa palustris, Rumex maritimus, Spergularia rubra. Trifolium hybridum. Veronica anagallis-aquatica; Riccia cavernosa

Constant species: Alopecurus aequalis. Callitriche palustris s. l. (predominantly C. palustris s. str.), Carex bohemica. Eleocharis ovata. Gnaphalium uliginosum. Juncus bufonius. Limosella aquatica. Persicaria lapathifolia. Rorippa palustris. Rumex maritimus

Source: Šumberová K. (2011): MA Isoëto-Nano-Juncetea Br.-Bl. et Tüxen ex Br.-Bl. et al. 1952. 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. 309-312.