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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

  Views:

  1017

  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.

• New data on the Hungarian adventive flora: Acer opalus Mill. subsp. obtusatum (Waldst. et Kit. ex Willd.) Gams 1925 in Hungary

  229-238

  Márton Korda

  Views:

  73

  Acer opalus Miller 1768 because of its complex taxonomic status can be interpreted as a collective species which contains several species and subspecies depending on different interpretations. An important adventive occurrence from this collective species was found in a forest that belongs to the Tétényi plateau (Budapest, 11th district) in July of 2009. It is proved to be Acer opalus Mill. subsp. obtusatum (Waldst. et Kit. ex Wild.) Gams. The natural range of the subspecies covers the eastern side of the central Mediterranean Sea region and western Balkan Peninsula. It is a submediterranean-mediterranean, thermophile, shade-tolerant taxon but often appears together lightdemanding species too. In its native range it occurs in beech, pine, sessile oak forests and in different types of dry oak forests as admixed tree species. The subspecies was found in a turkey oak – sessile oak community in Hungary. Several old, seed growing individuals live on the spot which have had continuous seed production. Therefore from the old trees to the young seedlings different age categories are represented.