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Data to the flora and geobotany of Kisalföld (Lesser Plain) region, NW Hungary
235-253Views:145Lesser Plain (Kisalföld) – divided among three countries (Austria, Hungary and Slovakia) – is the westernmost part of the lowland areas of the Pannonian Basin. Present paper provides a résumé of the authors’ floristic work from the Hungarian part of the area, describing localities, habitats and regional phytogeography of 57 taxa altogether. The localities were listed according to the classification of small geographic regions. The most important results of the study are as follows:
- We recorded 5 species new to the region (Brachypodium rupestre, Bromus ramosus, Hypericum dubium, Lathyrus sphaericus, Tordylium maximum); all of them can be considered as submontane-montane elements.
- We reported several species new to a microregion within the Lesser Plain: montane species in the W-SW part of the Plain (Cirsium rivulare, Dryopteris dilatata, Equisetum telmateia), loess-connected species mainly on the Moson Plateau (Agropyron cristatum, Allium atroviolaceum, Euphorbia salicifolia, Viola ambigua); and occurrences of species on sandy soils near the Lake Fertő (Draba nemorosa, Stipa pennata).
- We explained the known localities of several salt tolerant species (e.g. Carex divisa, Crypsis alopecuroides, Juncus maritimus, Limonium gmelinii, Suaeda pannonica) from the Lake Fertő and its surroundings.
- We assessed the role of the forest management and nature conservational actions in the distribution of some important tree species (Acer tataricum, Betula pubescens, Fraxinus ornus, Quercus petraea, Salix pentandra).
- We discussed the regional nature conservational status of several protected and/or threatened species (e.g. Allium carinatum, Allium suaveolens, Carex strigosa, Hottonia palustris, Potamogeton coloratus, Stellaria palustris) in the Lesser Plain.
The activities of the authors in the surroundings of Győr were supported by monitoring results gained during the Hungarian Little Plain project (LIFE08 NAT/H/000289).
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Short communications
257–266Views:7571. Occurrence of Ophioglossum vulgatum in a dry loess grassland in the Tiszafüred–Kunhegyes plain (Great Hungarian Plain)
2. Dolomite rocky grassland species introduced by raw materials of a road construction (Kecskemét, Great Hungarian Plain)
3. Geranium divaricatum on the Hevesi-sík, next to Füzesabony (Great Hungarian Plain)
4. Ophrys sphegodes in the Castriferreicum (W Hungary)
5. First occurrence of Cephalanthera longifolia var. rosea in Hungary
6. Spiraea crenata in the Eastern Bakony Mts (Transdanubian Range, Hungary)
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Multiclavula mucida (Basidiomycota) and other cryptogamic taxa in the Hungarian flora
173–184Views:324The paper deals with the species found during cryptogamic flora mapping in 2023 that are remarkable from a floristic, taxonomic or conservational point of view. We present data from the Bükk Mts of two Trapeliopsis species which appear to be rare in Hungary. Multiclavula mucida, which is apparently a rare basidiomycete lichen species in Europe that prefers humid, montane habitats was discovered in the Mecsek Mts as a new species for the Hungarian flora. Of the knothole moss, Anacamptodon splachnoides, which is now thought to be entomophilic, we communicate the only extant population from Southern Transdanubia. We report the first occurrence of the atlantic-mediterranean Leptodon smithii from the Hungarian side of the Great Hungarian Plain. Numerous data of the corticole Neckera pennata indicate that in Hungary the distributional centre of this species is situated in the county of Baranya in the lowlands. New data from the Bükk Mts underline that in the Pannonian region Buxbaumia viridis is primarily a terricole species of acidophilous beech forests. We communicate the first occurrence from the lowlands of the alien lignicolous Sematophyllum adnatum which is dangerously spreading in Europe, at the same time one of the most vigorous populations in the Pannonian region. The third Hungarian occurrence of Callicladium haldanianum, a species that seems to spread in bogs, as well as the second occurrence of Racomitrium lanuginosum, growing abundantly on an andesite boulder scree in Mátra Mts, are also reported here. Of Phegopteris connectilis we present in photographic documentation the first extant population from Southern Transdanubia, and we discuss whether the first publication from Mecsek Mts is correct or exact. In addition to listing the floristic data, we also briefly discuss the (mis)use of distribution data in the context of climate change, the difficulties of distinguishing the microtaxa of some pteridophytes, e.g. Asplenium adiantum-nigrum agg. and Dryopteris affinis agg., and we correct one of our previously published, erroneous Hedwigia stellata data. Some interesting data of other taxa (such as Leucobryum glaucum, Palustriella commutata, Tetraphis pellucida, Gymnocarpium robertianum, Ophioglossum vulgatum) are also mentioned in the paper.
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Distribution and flora of areas with alkaline and saline soils in the Mezőföld, Hungary
39-61Views:237Areas with alkaline and saline (solonetz and solonchak) soils occupy substantial areas in the westernmost, Transdanubian part of the Great Hungarian Plain (Mezőföld). To this date, the flora and vegetation of only two localities have been studied in some detail, while the rest has remained largely unknown in this respect. In this paper, I provide brief descriptions of these little-known areas and present a list of halophytes with distribution data from the last 17 years. The names of the plants are followed by the name of the township and the geographical location where the plant was found, the code of the grid cell of the Central European Flora Survey grid that includes the location, and in selected species, the year when the species was first recorded. The list is arranged in alphabetical order irrespective of taxonomy. The occurrence data indicate that the floras of these saline-alkaline areas represent only subsets of, but in combination are almost identical to the overall flora of similar habitats in the Sárvíz plain.
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Short communications
106–111Views:2751. New localities of Fumana procumbens in the North Hungarian Mountains
2. Strong populations of dwarf heliotrope (Heliotropium supinum) at Pentezug Wild Horse Reserve (Hortobágy, Great Hungarian Plain)
3. New occurrences of Chamaecytisus rochelii on the Great Hungarian Plain
4. Spontaneous occurrences of Daphne laureola in urban parks
5. Occurrence of Lindernia procumbens and L. dubia in Budapest city (C Hungary)
6. Confirmation of occurrence of Moneses uniflora near Kőszeg town (W Hungary)
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Contributions to the Atlas Florae Hungariae XIII.
85-88Views:58007The present paper is the 13th in a series of papers contributing new floristic data to complement the distribution maps of Atlas Florae Hungariae. We present altogether 1307 new occurrence data to advance our knowledge of the distribution of vascular plants in Hungary. New data are presented for 634 vascular plant species from 256 flora mapping quarter quadrates (CEU). Due to the unevenness of data collection, the data are highly dispersed over the area of Hungary. Most of the presented occurrence data are from the Great Hungarian Plain, the North Hungarian Mountains, and the Little Hungarian Plain regions. The enumeration includes rare native species (e.g., Androsace maxima, Erysimum crepidifolium, Orobanche gracilis, Peucedanum palustre, Pulsatilla zimmermannii, Scopolia carniolica, Vicia biennis), rare or data deficient adventive species (e.g., Euphorbia prostrata, Euphorbia serpens, Lindernia dubia), subspontaneous occurrences of native species (Asplenium scolopendrium, Daphne laureola, Chenopodium opulifolium), species spreading along linear infrastructure (Eleusine indica, Plantago coronopus, Sorghum halepense, Spergularia salina, Tragus racemosus), and also common native species with data deficient distribution maps (Agrostis stolonifera, Bromus benekenii, Bromus japonicus, Carex caryophyllea, Carex divulsa subsp. divulsa, Equisetum ramosissimum, Vulpia myuros).
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Contributions to the escaped, naturalised and potentially invasive species of the Hungarian adventive flora
111-156Views:609In this paper we compiled data on 157 Hungarian adventive plant species – of which 65 had not been reported from the country previously – from 47 settlements of Transdanubia and the Great Hungarian Plain. These taxa are rare, interesting or not included in the most recent list of the Hungarian neophyte species. The list includes data about many rare, occasionally escaping species (e.g. Lagurus ovatus, Salvia coccinea), taxa considered incapable of reproduction under the recent climatic conditions of the Pannonian Basin (e.g. Cupressus sempervirens, Punica granatum) or naturalised plants that may become invasive in the future (e.g. Celtis sinensis, Lonicera japonica). In the outlook we highlighted some special urban habitats (e.g. private and botanical gardens) and practices (e.g. public green space management) that endanger the native flora. We also describe their role in promoting the appearance and the expansion of alien plant species, and processes (e.g. laurophyllisation, spread of thermophile species) that will become increasingly common in the future as a result of climate change.
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Floristic data from the central part of the floristic region ‘Crisicum’ (E Hungary)
317–357Views:295This paper reports new floristic data of 207 taxa. Data collected between 2005 and 2015; originated from the central part of the floristic region ‘Crisicum’ (i.e. the E part of the Great Hungarian Plain), which is a currently poorly studied area of Hungary from a floristic point of view. The paper reports occurrence localities for some rarities such as Asplenium trichomanes, Marsilea quadrifolia, Sisymbrium polymorphum, Viola stagnina, Gentiana pneumonanthe, Elymus elongatus, Montia fontana subsp. chondrosperma, Ranunculus rionii, Ranunculus illyricus, Myagrum perfoliatum, Sedum caespitosum, Vicia biennis, Dorycnium herbaceum, Oenanthe banatica, Peucedanum cervaria, Echium italicum, Digitalis lanata, Valerianella rimosa, Craex buekii, Cephalaria transsylvanica, Cyperus pannonicus.
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Bryophyte flora of the Arboretum of Szarvas (Hungary, Békés county)
140–152Views:400In this study we present the current moss and liverwort flora of the Arboretum of Szarvas. The observations were made in 2017, 2019, 2020 and 2021. Altogether 95 bryophyte taxa (7 liverworts and 88 mosses) were identified. Most of them are considered to be common in Hungary, however some species are rare in the Great Hungarian Plain: Lophocolea coadunata, Climacium dendroides, Hylocomiadelphus triquetrus, Pleurozium schreberi, Polytrichum formosum, Rhytidiadelphus squarrosus, Ulota crispula, Zygodon rupestris. These results also confirm the conservational and scientific value of the arboretum.
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Disappearing botanical and cultural heritage of wooden headboard-graveyards in Eastern-Hungary and Transylvania (Romania)
51-64Views:180Degradation or disappearance of natural habitats are global phenomena nowadays, hence the role of small and secondary (seminatural) habitats like cemeteries in preserving natural values are more and more appreciated. The botanical values and burial customs were examined in a total of 51 graveyards in three different regions of Hungary and Romania (10, 19 and 22 graveyards in the North Hungarian Mountains, the Great Hungarian Plain and Transylvania, respectively). Altogether 25 in Hungary legally protected plant species were found, 1.5 protected species per graveyard on average. As we observed, traditional burials with wooden headboards are rapidly superseded by modern burial customs. Based on our non-representative poll (n=102), 90% of citizens on average are satisfied with current conditions in Hungarian graveyards. A two-thirds majority of respondents would prefer more frequent lawn-mowing in graveyards. 75% of respondents prefer modern tombs to traditional graves. Disappearance of old burial customs characterised by the use of wooden headboards (and the simultaneous change in traditional, habitat-friendly practices in graveyards) means not only a loss of cultural values, but threatens the natural biodiversity of graveyards as well.
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Floristic data from the northern edge of the floristic region ‘Crisicum’ (NE Hungary) II.: Borsodi-ártér és Sajó–Hernád-sík
169–186Views:425In this paper we provide new floristic data for 126 species and one hybrid from the Borsod Plain and the Sajó–Hernád Interfluve (Borsod-Abaúj-Zemplén county, Northeast Hungary) observed between 2006 and 2019. A significant proportion of the data is related to gravel mining activities in the area. We present new localities for rare or sporadic native taxa in Hungary (e.g. Chenopodium murale, Ch. rubrum, Lycopsis arvensis, Chamaenerion dodonaei, Reseda luteola, Senecio viscosus, Gnaphalium luteoalbum, Cyperus glomeratus) as well as rare or sporadic adventive weeds (e.g. Lepidium densiflorum, L. virginicum). We publish additions to the distribution of several legally protected species (e.g. Pseudolysimachion longifolium, Nymphoides peltata, Epipactis tallosii, Leucanthemella serotina). Presence of some taxa is remarkable regarding to the flora of the whole area of Crisicum (Sherardia arvensis, Thymelaea passerina, Silene conica) or the Great Hungarian Plain (Monotropa hypopitys).
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Leucanthemella serotina in the Dráva Plain (Hungary)
227-230Views:344New stands of Leucanthemella serotina (L.) Tzvelev were found on the Hungarian side of the Dráva Plain. This legally protected species has not been found in the region for about 150 years. In the text, we report the maximum plant height, and thousand seed weight of the species as well as the species composition of its preferred habitats.
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Data on the distribution of some protected plant species and on their presence in secondary habitats
183-199Views:1828In this paper, I publish my floristic data on some protected and strictly protected plant species collected in Hungary between 2016 and 2021. The data published in this paper cover 31 micro regions of Hungary, but most of them come from the Great Hungarian Plain, especially from Pest and Bács-Kiskun counties. I describe the occurrences of 41 protected and three strictly protected vascular plant species (two ferns and 42 flowering plants), some of which represent new data for the particular micro region or even larger geographical areas (e.g. Botrychium matricariifolium, Thlaspi alliaceum and Nasturtium officinale). For some species, the published data either come from floristically understudied areas (e.g. Ranunculus illyricus, Vinca herbacea and Cardamine amara) or are considered rare in the certain region and/or in the whole country (e.g. Apium repens, Cnidium dubium and Vicia narbonensis). For other species, the newly reported occurrences are presented as complement to the already known distribution data (e.g. Cephalanthera damasonium, C. rubra, Linaria biebersteinii, Sonchus palustris and Agrostemma githago). In support of the nature conservation actions, I provide data from the flora of some floristically understudied micro regions (e.g. Dorozsma-Majsai Sand Ridge, Bácskai Loess Plain) and try to highlight the role of canals in Hungary in species and biodiversity conservation, by the example of the Danube-Tisza canal. In this manuscript, I publish data on twelve protected plant species from the Danube-Tisza canal and its canal bank (eg. Peucedanum palustre, Carex paniculata, Clematis integrifolia).
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The ‘rediscovery’ of the Birdsfoot Fenugreek (Trifolium ornithopodioides (L.) SM.) in the Hortobágy, Hungary
207–212Views:338In 2009, the first author discovered an unknown population of Trifolium ornithopodioides in the Ágota-puszta of Hortobágy plain. In 2016, the second author found an another population in the vicinity of Karcag (Ecse-zug puszta). Up to now there was only one published occurrence of this species from the region. The specimen collected by Szujkó-Lacza Júlia, Kováts Dezső and Fekete Gábor in 1974 was deposited in the herbarium of the Hungarian Natural History Museum (BP), but this incomplete specimen was misidentified, and not Trifolium ornithopodioides. Therefore, this newly discovered site at Ágota-puszta should be regarded as the first trustworthy occurrence of this species at the Hortobágy plain.
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The Sea milkwort (Glaux maritima) in the Carpathian Basin
10-20Views:336Sea milkwort (Glaux maritima L.) is a broadly distributed species in the northern hemisphere, inhabiting primarily maritime habitats from the arctic to the temperate zones. It is also found inland in semi-arid and arid regions with saline soils. Its status in the Carpathian Basin has become very uncertain owing to the lack of known extant populations. To evaluate its current status, I review all known occurrences within the Carpathian Basin where this species has been recorded or collected, and report five new localities of the species in Hungary, all in the western part of the Great Hungarian Plain. I also analyze habitat relationships of the species using traditional phytosociological relevés. Review of species distribution data in the Carpathian Basin revealed that sea milkwort has undergone severe reduction in population number and disappeared from many localities. Currently, only a few populations can be found in this region: the Northern Carpathians in Slovakia and the western part of the Great Plain in Hungary. In Transylvania (Romania), only a single population has been reported recently suggesting the critical status of the species there. Features of the habitats confirm the halophytic nature of the species and its fidelity to wet saline meadows. Its common accompanying species are mostly broadly distributed, salt-tolerant plants. Heterogeneity of the samples in species composition suggests that sea milkwort is not a habitat-specialist species. Several of its common associates in Hungary are also found in sea milkwort habitats in Mongolia, Asia and Utah, North America. Based on the available evidence, sea milkwort shall be considered a severely threatened plant in the Carpathian Basin. Characteristics of the vegetation in its habitats do not explain its occurrence in mountainous environments.
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Data on the occurrence of sedge species (Carex, Cyperaceae) in and around South Nyírség (East Hungary)
165-198Views:423We provide floristic data on a total of 38 sedge species in the area of South Nyírség and its immediate surroundings. We also detected some populations of previously undescribed or rare species in the Hungarian Great Plain, such as Carex buxbaumii, Carex hartmanii, Carex umbrosa, and Carex paniculata. We report several new occurrences of species with little literature data from the area, such as Carex brizoides, Carex michelii, Carex pallescens, Carex elongata. However, during the last 13 years, we were not able to detect seven species previously mentioned in the literature. Herbarium data confirmed that some of the older Carex nigra occurrences for the area actually refer to Carex cespitosa. Based on herbarium data and the literature, we think that local data on Carex pairaei may largely refer to Carex divulsa subsp. leersii and/or Carex spicata. Contrary to many pieces of literature, Carex vulpina was not observed inside the sandy area.
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Short communications
404–411Views:6611. Cephalanthera damasonium (Mill.) Druce in the Buda Arboretum
2. Opuntia phaeacantha Engelm. in the West-Transdanubia (W Hungary)
3. Yucca filamentosa L. in the South-Nyírség (E Hungary)
4. New occurrences of Chamaecytisus rochelii (Wierzb.) Rothm. on the Hungarian Great Plain and corrections on its previous occurrence data
5. Hybrid birch (Betula ×rhombifolia Tausch.) in the central part of Mátra Mountains
6. A csipkés gyöngyvessző (Spiraea crenata L.) újabb temetői előfordulása / A new occurrence of Spiraea crenata L. in a Hungarian graveyard
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Carpathian, Transylvanian, Dacian and Pannonian elements in the flora of Sălaj region (NW Romania)
259-267Views:158This paper gives an account of biogeographically interesting plant species of the traditional ethnographic region Sălaj (in Hungarian: “Szilágyság”, NW Romania). The flora of the region, which is situated between the Transylvanian Basin and the eastern part of the Great Hungarian Plain, contains, besides the prevailing European species, a significant percentage of plant species from different biogeographic regions. Among these we noticed the continental species of eastern origin, as well as southern Sub-Mediterranean species broadly distributed in this area. A significant number of other interesting species is further represented by the endemic and sub-endemic Carpathian (Aconitum moldavicum Hacq., Symphytum cordatum Waldst. & Kit.), Transylvanian (Cephalaria radiata Griseb. & Schenk, Onosma pseudoarenaria Schur subsp. pseudoarenaria), Dacian (Helleborus purpurascens Waldst. & Kit., Phyteuma tetramerum Schur) and Pannonian (Centaurea sadleriana Janka), species, which occur in very different habitats.
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Hungarian folk names of plants collected by Lajos Timár in the 1940s and 1950s
156-172Views:72This article presents Lajos Timár’s manuscript written in the 1950s. The original 24-page script includes folk names of plants collected by the author and his colleagues from the region along the river Tisza between Szolnok and Szeged (or Horgos) villages. Lajos Timár practised his collecting work in the 1940s and 1950s. He completed his list with previously published folk names coming from the area. The manuscript consists of 508 folk names of plants. This is the first time that the entire study appears in print. The article surveys the afterlife of the script as well.
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Floristic data from the northern edge of the floristic region ‘Crisicum’ (NE Hungary)
275-294Views:183This paper reports new floristic data of 161 taxa. Most of these data were collected between 2011–2013, and are coming from the northern edge of the floristic region 'Crisicum', the NE part of the Great Hungarian Plain, which is a little-known area from a floristic point of view. 43 CEU quarterquadrates and territory of 35 settlements are represented by the dataset. The paper reports occurrence localities for legally protected (e.g. Ophioglossum vulgatum, Stellaria palustris, Ranunculus polyphyllus, Thlaspi jankae, Lathyrus palustris, Elatine spp., Lycopsis arvensis, Lindernia procumbens, Cirsium brachycephalum, Cyperus pannonicus), strictly protected (Armoracia macrocarpa, Vicia biennis) and some little-known (e.g. Cardamine parviflora, Reseda luteola, Melilorus dentatus, Veronica catenata) taxa. Numerous data of alien species (e.g. Lepidium densiflorum, Euphorbia maculata, Sicyos angulatus, Erechtites hieracifolia, Elodea nuttallii, Elymus elongatus, Eleusine indica, Sorghum halepense, Eriochloa villosa) are also published. The most important data are documented by voucher specimens deposited in herbarium of Debrecen University (DE).
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Discovery of a new large population of Prunus tenella on a young old-field suggests remarkable regeneration ability of the species
32-38Views:329Kurgans are ancient burial mounds built by nomadic steppic cultures across Eurasia.
These monuments are important cultural landmarks, and often also preserve the remnants of dry grasslands even in intensively used agricultural landscapes. In the past centuries, many kurgans have been ploughed and their vegetation has been destroyed. Due to their recent inclusion in the agrienvironmental schemes in Hungary, crop production has been ceased on many kurgans in the past years. Here we present an interesting botanical discovery which we made during our country-scale survey of spontaneously recovering grasslands on kurgans. We discovered a large population of approximately 15,000 shoots of the protected loess grassland plant Prunus tenella Batsch (syn.: Amygdalus nana L.) on the Fekete-halom kurgan near Tiszainoka, in the centre of the Great Hungarian Plain. The mound had been used as an intensive cropland until 2014. Most probably, the plants could re-establish from some hidden shoots that could persist in the refuge provided by the concrete elements of a geodesic mark, and after the cessation of ploughing it could expand onto the north and west-facing slopes of the mound by sprouting and by germination from the persistent soil seed bank. Besides the conservation importance of this floristic discovery, it also suggests that spontaneous regeneration can be an effective restoration measure and that kurgans abandoned from agricultural cultivation can serve as suitable habitats for rare and endangered species. -
Mondró-halom kurgan (Hencida, East Hungary), a refugium of loess grassland vegetation
143-149Views:514Fragments of the natural grassland vegetation are often preserved only in those areas which are inadequate for arable farming. In many cases kurgans hold the last remnants of dry grasslands in lowland areas, like the Great Hungarian Plain. They also have an essential role in preserving cultural and landscape values. Moreover, they harbour several rare plant and animal species. Our aim was to explore the vegetation of the Mondró-halom kurgan (Hencida, East Hungary). Altogether we found 74 vascular plant species in the loess grassland of the kurgan. Several rare species of the Bihari-sík region, such as Inula germanica, Ranunculus illyricus and Rosa gallica were also detected. The steep slopes of the kurgan with various micro-sites and exposures supported a species-rich vegetation. Instead of its small area it harboured several forest steppic species and several steppic flora elements (Continental, Pontic-Mediterranean, Pontic, Pontic-Pannonic and Turanian).
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Oak-ash-elm forests in the Nyírség
179-220Views:155This paper presents phytosociological analyses of oak-ash-elm forests of Nyírség, NE Hungary. These climatically azonal forests grow in habitats where the soil is under the continual influence of the groundwater table, which maintains rather mesic conditions. They are particularly rich in Fagetalia elements (Actaea spicata, Allium ursinum, Anemone ranunculoides, Asarum europaeum, Athyrium filix-femina, Cardamine bulbifera, Carex pilosa, Cerastium sylvaticum, Chaerophyllum aromaticum, Corydalis cava, Dryopteris filix-mas, Epipactis helleborine agg., Euphorbia amygdaloides, Galeobdolon luteum, Galium odoratum, Hedera helix, Isopyrum thalictroides, Lathraea squamaria, Lathyrus vernus, Lilium martagon, Majanthemum bifolium, Mercurialis perennis, Milium effusum, Polygonatum multiflorum, Pulmonaria officinalis, Ranunculus cassubicus, Salvia glutinosa, Sanicula europaea, Scilla vindobonensis, Stachys sylvatica, Stellaria holostea etc.) typical in the submontane regions of this part of Europe. It is possible that they are remnants of the vegetation dominating the region under the less continental and more moist climate during the Beech phase (2500–800 BC) of the Holocene.
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Short communications
262-271Views:5951. Elatine alsinastrum and other floristic records from the Buda Mts (central Hungary)
2. Eleusine indica in the ‘Maros–Körös köze’ region (SE Hungary)
3. The spread of Panicum dichotomiflorum in the North Hungarian Mts; new records from Gyöngyös and Felsőnyárád (NE Hungary)
4. Symphyotrichum ciliatum in the Sajó–Hernád plain (NE Hungary)
5. Alnus incana and Vitis sylvestris in the Által-ér valley (NW Hungary)
6. Contributions to the distribution of Euphorbia prostrata and Euphorbia serpens in Hungary
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Dry oak woods on the Szentendre Island
147-178Views:162The phytosociological characteristics of the oak woods on the Szentendre Island were first studied 70 years ago. We conducted a follow-up study to determine the phytosociological relationships of theses woods and assess their possible changes over time. We found that these woods are most similar in their phytosociological characteristics to the closed pedunculate oak forests occurring in the high floodplain in the Szigetköz area (Melico nutantis-Quercetum roboris) along the Danube. Our results also showed a marked increase in the proportion of natural weeds, introduced species and invasive aliens in the studied woods.