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Tokom istraživanja ruderalne vegetacije u gradovima širom Srbije, u tri grada u dolini reke Save zabeležena je nova strana vrsta za floru Srbije, Amaranthus tuberculatus (Amaranthaceae). A. tuberculatus je jednogodišnja biljka poreklom iz Severne Amerike i za sada jedina dvodoma vrsta roda Amaranthus u Srbiji. Naturalizovane populacije su primarno zabeležene u remećenim staništima na obali reke Save u Sremskoj Mitrovici, Šapcu i Beogradu. Vrsta A. tuberculatus je nedavno po prvi put registrovana u dve susedne zemlje, što dodatno ukazuje na širenje areala vrste na Balkanu.

Amaranthus tuberculatus (moq.) J. D. Sauer: A new naturalized alien species in Serbia