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• Results of the Vincetoxicum pannonicum population survey (2001–2019)

  9–18

  Sándor Bérces

  Sándor Bíró

  Adrián Novák

  Antal Halász

  György Dudás

  Dániel Pifkó

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  949

  The Pannonian swallow-wort (Vincetoxicum pannonicum (Borhidi) Holub) is endemic to the Pannonian biogeographical region, occurring only in the Buda and Villány Mts in Hungary. Current distribution and population size of this rare plant species is surveyed. The species is recorded from the following localities: Budajenő: Községi erdő, Budaörs: Szekrényes, Kő-hegy, Odvas-hegy, Szállás-hegy, Út-hegy, Páty: Fekete-hegyek; Nagyharsány: Szársomlyó. According to our research, the total number of individuals is around 3550. The largest populations were found at Községi erdő (Budajenő), Szállás-hegy (Budaörs) and Fekete-hegyek (Páty). In the Villány Hills (Mt Szársomlyó) ca 50 specimens were counted. The peak flowering period of Vincetoxicum pannonicum was observed between 20^th and 29^th of May.