A Callitriche brutia komplex tagjai (C. hamulata, C. brutia subsp. brutia és subsp. naftolskyi) Magyarországon

This article summarizes the recent occurrences of taxa of the C. brutia complex in Hungary. Formerly, C. hamulata was known from Hungary based on a specimen of uncertain origin from Vas County. The first confirmed record of the species date back to 2014, since then it has been found from from a total of 4 localities in streams in Western Transdanubia and along the Danube. The first detec­tion of C. brutia subsp. brutia was in 2016 in the Kunkápolnás marsh of the Hortobágy region, and since then the subspecies has been spreading in the area. The subsp. naftolsky was found in 2024 in a terres­trial form in a saltwater marsh in the Dél-Tiszántúl region. While C. hamulata is probably a native member of the Hungarian flora, the two subspecies of C. brutia may have colonised more recently, probably introduced by birds. Their colonisation may be related to the ongoing climate change, which has resulted in the introduction of plants from the Mediterranean region, often by natural means.