Stellaria ruderalis M. Lepší, P. Lepší, Z. Kaplan et P. Koutecký, a new species record for the flora of Ukraine

Stellaria ruderalis is an annual (semi)ruderal species from the S. media group, which has been recently published by Lepší et al., therefore, its distribution range in Europe is insufficiently known. This paper is based on field exploration of 39 localities of S. media s.l. in the Lviv region, Western Ukraine. The first report of S. ruderalis in Ukraine comes from Dmytre village, where it grows at roadsides and arable field edges in a semiruderal habitat of the alliance Aegopodion podagrariae. As only a single population was found, Stellaria ruderalis is obviously still spreading in Western Ukraine, a fact which was reported already for northern Central Europe. This record represents the northeasternmost locality of the species so far known.