A new invasive weed record for Turkey: Alternanthera sessilis (Amaranthaceae).
A tropical weed, Alternanthera sessilis (L.) R. Br. ex DC which is defined as invasive plant by organisations like CABI (Invasive Species Compendium) and EPPO (European and Mediterranean Plant Protection Organization) was encountered at the banks of the Asi River (Hatay) as three populations. So, it was determined that the species have entered to our country also after the countries like Iran, Iraq, Jordan and Israel. The species was introduced with taxonomical and morphological features herein. Its ecological impact evaluated with potential risks also.