Review of the weed species presented on natural grasslands of Serbia

In the present paper 48 grassland communities in Serbia have been analyzed. Marshy and wet meadow, sub-mountainous, mountainous and alpine grassland phytocoenoses have been included. The sum of 549 species was determined in grassland weed habitats. Those weed species were classified in 231 genera from 52 families. The following families are especially rich regarding the number of weed species within: Asteraceae (85 weed species), Poaceae (44), Scrophulariaceae (37), Caryophyllaceae (36), Lamiaceae (34), Rosaceae (24), Cyperaceae (22) and Fabaceae (19). Weed species exhibit great infraspecies diversity, they envelope 249 subspecies, 347 varieties and 349 forms. In biological spectrum the most dominant are chemicryptophytes (50.57%), followed by geophytes (15.46%), therophytes (14.91) and thero-chemicryptophytes (7.73%). Chorological analysis showed that in weed’s flora of grasslands of Serbia there are 25 different geoelements, where among them more than 50% belong to the floral elements of huge areas of distribution: European Asian, subeurope-asian, middle European and cosmopolitan. Percept of occurrence of the weed species ranged from 50.7% (in class Festuco-Brometea) to 91.3% (in class Phragmitetea).