Recent distribution and phytosociological affiliation of Ludwigia palustris in Slovakia

Abstract

Ludwigia palustris has always been a very rare species in Central Europe. In Slovakia, its occurrence remained unconfirmed for over 60 years and it was therefore considered extinct. The paper reports its rediscovery on two sites in SE Slovakia. Both localities were found in the Latorica River catchment area in 2015 when persistent summer droughts enabled the development of natural mudflat vegetation in the dried oxbows. Confirmation of this historic site indicates the long-term survival ability of the species. We assigned L. palustris dominated vegetation in the class Isoëto-Nanojuncetea, association Ludwigio palustris-Lindernietum procumbentis. This association is new to Slovakia as well as for Central Europe. The stands of this association developed on the exposed muddy shores of disconnected oxbow lake.

Ranunculus polyphyllus Willd. still grows in Slovakia

“…Ranunculus polyphyllus is not the only threatened species to be re-discovered in recent years in east Slovakia. Other extremely rare species whose occurrence is restricted to temporary wetland habitats of the Východoslovenská nížina Lowland include Schoenoplectus supinus (Zlacká et al 2006), Ludwigia palustris (Dítě et al 2017) and Carex bohemica (Dítě et al 2015). The recent occurrence of R. polyphyllus underlines the uniqueness of the intensively used landscape of Východoslovenská nížina which still harbours a variety of Slovakia's preserved wetland habitats.…”