Sigesbeckia orientalis L. – new allochthonous species in the Serbian flora

Abstract

In Serbia, Sigesbeckia orientalis L. was discovered for the first time in 2015 on the territory of the Special nature reserve "Obedska bara". Thus, much of what is known about this species relies on earlier studies in the surrounding regions. Its most important morphological characteristic is its ability to blend in with its surroundings, rendering it almost indistinguishable from other species in its habitat. Extensive field research conducted every year since 2015 until 2022 confirms that Sigesbeckia orientalis is widespread at the two locations in the SNR "Obedska bara". The first is located along tarmac roads leading through cultivated poplar forests, while the second is located along tarmac roads and in natural mixed forests. The populations were already established at the investigated sites at the time of the first discovery. Based on the results of the study, measures to prevent, eradicate and control this invasive species are recommended to the managers of protected areas.