Abstract: The paper describes some phytocoenoses from the Isoëto-Nanojuncetea Br. Bl. et Tx. 1943 class, exemplified by Mentha pulegium L. and Pulicaria vulgaris Gaertn., from two protected areals from Timiș county, the Surduc lake and the Murani-Pișchia Marshes. Our samplings were carried out during summer 2011, during the period when these vegetal communities displayed maximum occurrence. One can find a number of 50 species in the synthetic table, with an average of 13.5 species / lot, at Surduc and 16.25, at Murani. The characteristic species nucleus agrees with the data found in specialty literature (COLDEA, 1997, SANDA et al., 2008). A number of 28 species from our list can also be found in the national synthesis comprised by COLDEA (1997). We consider these phytocoenoses important for the overall humid area biodiversity, for the preservation of some species (e.g. Lindernia procumbens (Krock.) Philcox, species from Annex II of the Directive 92/43/CEE, identified in the Surduc phytocoenoses) and in the vegetation dynamics process, since they represent pioneering stages and depend on the flooding of the ground they occupy. What is more, the two lakes suffer water level oscillations and undergo high anthropic pressure, which determines an uncertain existence for these communities.

Key words: humid depressions, pioneering vegetation, Mentha pulegium L., Pulicaria vulgaris Gaertn., Lindernia procumbens (Krock.) Philcox, protected areas

Presentation: oral