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• Floristic data from the Great Plain of Hungary (Alföld)

  304–316

  Márton Korda

  Dávid Schmidt

  Róbert Vidéki

  Győző Haszonits

  Viktor Tiborcz

  Ágnes Csiszár

  Gergely Zagyvai

  Dénes Bartha

  Views:

  230

  In this study we report relevant occurrence data of 49 species and hybrids and their habitats from the Great Plain registered in the period between 2011 and 2017. Due to importance for nature conservation, we present additional data of further 13 species. Most of the data are originated from riverine oak-elm-ash forests of South East Hungary (from the region of Gyula, Békéscsaba, Doboz settlements). The most important result of our study is the rediscovery of Gagea minima and Dictamnus albus. Besides, we report new occurrence data for the Great Plain (Alföld), as well as for the flora of the microregions in questions (e.g. Draba muralis, Nicandra physalodes, Cystopteris fragilis) and also present the data of the regionally endangered species (e.g. Inula helenium, Ophioglossum vulgatum). Some rare weed taxa (e.g. Calepina irregularis, Cardamine impatiens), spreading adventive taxa (e.g. Chorispora tenella, Euphorbia maculata, Phytolacca americana, Ph. esculenta, Sicyos angulata) and in surveys rather underrepresented species (e.g. Loranthus europaeus, Arabis hirsuta, Rumex confertus) are reported too.

• Contributions to the flora of the Danube River in Komárom-Esztergom and Fejér counties (Hungary)

  157–168

  Norbert Riezing

  Views:

  289

  The present paper focuses on the aquatic and Nanocyperion vegetation of the Danube flood­plain. Most of the data show the results of the surveys in 2019 at low water levels. The Nanocyperion and aquatic vegetation of the Komárom-Esztergom County section is relatively well researched com­pared to the Fejér County section which was previously poorly known. In the last decade, two rare spe­cies – Hippuris vulgaris and Hydrocharis morsus-ranae – have disappeared between Gönyű and Neszmély (Komárom-Esztergom County). In contrast, several new invasive plants have appeared: Salvinia molesta, Myriophyllum aquaticum, Limnobium laevigatum, and Crassula helmsii (first record from Hungary). Vallisneria spiralis and Elodea canadensis were detected again after several decades. Elodea nuttallii and Azolla sp. have become more widespread and abundant than previously. New and uncommon Nanocyperion species were the native and protected Lindernia procumbens and the inva­sive Lindernia dubia. New invasive plants in the studied Danube sections were: Cyperus esculentus, Euphorbia maculata, and Eleusine indica. The native Veronica catenata and Schoenoplectus triqueter have become more wide­spread than before. Polygonum graminifolium was an interesting find of open pebble surfaces in several parts of the examined area, which has no recent records in Hungary from before 2015 (published here).