A new locality of Macrosciadium alatum in the Western Bieszczady Mts.
(Duszatyn, Koma?cza district, Sanok county) is described in this paper. The
locality is currently the westernmost point of distribution of the species.
As Macrosciadium alatum is an invasive species, it is advisable to monitor it
cyclically in this area. A newly discovered diagnostic feature of this
species, not included in descriptions of this plant so far, is conically
elongated cells, i.e. papillae on the upper side of the petals. It is
suggested that this feature be used in the identification of representatives
of the Apiaceae family in Poland and Europe. The distribution map of the
species has been updated in this work.
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