Polygonum graminifolium Wierzb. in Slovakia and along the Hungarian-Slovak border on the Danube

Polygonum graminifolium Wierzb. is a poorly known plant that has been overlooked by botanists for more than half a century and until recently had no current records in Hungary and Slovakia. The study examines the occurrence of the species along the Hungarian-Slovak border on the Danube. In addition to old literature and herbarium data, it presents the currently known occurrences. Some of these, including the Slovakian one, are new localities. It is a rare plant on the open gravel (or stony) surfaces of the riverbed, which have been dry for a long time. Other species are often absent in these habitats. Other species (in low numbers) are found mainly where some silt or sand has been deposited between the gravels or stones. Polygonum graminifolium may occur elsewhere along the Danube, but it is often difficult to find. URL: https://www.upjs.sk/pracoviska/botanicka-zahrada/odborne-aktivity/contents-abstracts