Juncus Squarrosus (Juncaceae) in Romania: Its First Certain Occurrence and a New Plant Association for the Romanian Vegetation

This study confirms the first certain occurrence of Juncus squarrosus L., an Atlantic species, in the Romanian native flora. Characteristic plant communities with J. squarrosus occur in the Apuseni Mts (Western Romanian Carpathians). At these sites J. squarrosus has the southeastern limit of its European distribution. The identified plant communities with J. squarrosus in Romania are devoid of some Atlantic species present in Western and Central European communities and therefore are assigned to the Nardo-Juncetum squarrosi (Nordh. 1920) Bük. 1942 association. This plant community is a new syntaxon for the Romanian vegetation.