Abstract
The meadowlands from the middle and inferior basin of Crisul Negru river form an area with rich flora and vegetation suitable for a complex phytocoenological research and an ecologic and bio-economical study of the floor vegetation.
 After conducting a number of 80 phytocoenological surveys on the meadowlands near Apateu and Satu Nou villages (Arad county, Romania), respectively near Cociuba Mare and Mărțihaz villages (Bihor county, Romania) there have been identified a number of fifteen vegetal associations from which one is examined in this work.
 The paper presents the hygrophilic association Typhetum latifoliae Lang 1973 on the grasslands of the middle and inferior basin of Crişul Negru river, association classified from the coenotaxonomic point of view in the alliance Phragmition communis Koch 1926, order Phragmitetalia Koch 1926, class Phragmitetea australis R. Tüxen et Preising 1942.
Highlights
This study aims to analyze the phytocoenoses of the association Typhetum latifoliae Lang 1973 from the point of view of the floristic composition and by analyzing the spectrum of the floristic elements, the life forms spectrum, the karyotype spectrum and the ecological factors
The floristic and phytocoenological characterization of Typhetum latifoliae association Lang 1973 reveals that the composition includes seventeen varied species (Table 1)
Analysis of ecological indices for the associations found on the grasslands of the middle and inferior basin of Crisul Negru river highlight in terms of the soil wet the highest weight among mezo-hydrophilic species, in terms of temperature the micro-mesotherm species and in terms of the chemical reaction of the soil the predominant species are the chemical amphitolerant
Summary
The territory chosen for research, the meadowlands from the middle and inferior basin of Crisul Negru river, had not been studied thoroughly by those who had floristic and phytocoenological concerns and were not made many scientific communications and publications about this area. In their work the cited authors were related to a larger area without having done thorough studies. The complex study of flora and vegetation is absolutely necessary especially in regions with less or no researches. This association is common in our country and has been described by many author’s, including: in Oltenia (Roman, 1974), in Moldova (Mititelu et Barabaş, 1971; Chifu et al, 2006), in Transilvania (Kovács, 1969; Pop et al, 2002), in Muntenia (Ştefan, 1980), in Maramureş (Resmeriţă et Raţiu, 1974)
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