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A new alien species to the Hungarian flora: Polypogon viridis (Gouan) Breistr.
165–172Views:150Polypogon viridis (Gouan) Bresitr., a new alien species to the Hungarian flora, was detected between the years 2016–2019. Water bent (P. viridis), originating from the Mediterranean basin, was recorded from several plant nurseries and outdoor flowerpots in Transdanubia, Hungary. The new Hungarian records fit into the observed phenomenon that ornamental plant trade is an important factor in the spread of this species. Morphological characterization and insertion of P. viridis into the Hungarian identification key are also provided in this paper. Since P. viridis was represented in large numbers at some of the Hungarian localities, future monitoring of its spread may be important to evaluate the invasiveness of the species in the country.
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A new alien species in Hungary: Limnobium laevigatum (Hydrocharitaceae)
9-15Views:245The South American Spongeplant (Limnobium laevigatum (Humb. & Bonpl. ex. Willd.) Heine) is a floating aquatic plant native to freshwater habitats of tropical and subtropical Central and South America. It is frequently used for ornamental purposes in ponds and aquariums, and became invasive in the recent decades around the world. It has a high reproductive potential and a high dispersal capacity as well. It can form massive floating mats causing light limitation and creating anoxic conditions in the underlying water column, which strongly reduces native animal and plant biomass and diversity. It can also hamper navigation and water flow in rivers and canals. It has been introduced to the United States, Australia, Indonesia, Japan, Zambia and Zimbabwe. There is only one previous record in Europe (Belgium). This article is about the first record of Limnobium laevigatum in Hungary. I found two localities situated near Tata-Naszály and Dunaalmás (North-western part of Hungary). Both localities are fed by hot-water springs. It forms a small but dense population in Dunaalmás located near to the hot spring. The population in Tata-Naszály can be found in a 1.3 km long section of a stream, where it formed a sparse population in 2018.
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Asparagus verticillatus L. in Hungary
38-43Views:151Climbing asparagus (Asparagus verticillatus L.) a new adventive species to the Hungarian flora was recently discovered in the city of Pécs (South Hungary) in 2011–2012. Taxonomy, morphological description and current localities of the species are presented in this paper. A. verticillatus is a mediterranean-submediterranean species native in Balkan Peninsula, Eastern Europe, Western- and Middle Asia. The species is a popular ornamental plant in Hungary, but no data was available about its escape or naturalisation in the country so far. Herbarium specimens from Hungary were collected so far mostly from botanical and private gardens; only one specimen was collected in a dry grassland along a roadside in the city, respectively. The newly discovered small populations are located mostly in secondary dry grasslands, at the edges of vineyards and private gardens on the southern slopes of the Mecsek Mts and only one specimen was found far from the residential area in natural vegetation. Because climbing asparagus is a frequently planted ornamental plant in several locations of Pécs, further escape, naturalisation and persistence of the species is possible in the future.
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Contributions to the subspontaneous occurrences of Malva moschata (Malvaceae) in Hungary
200–202Views:103Malva moschata is an alien species in Hungary, seldom cultivated as garden ornamental plant. Although considered as occasional escapee from cultivation, Hungarian literature has only cited Budapest as an example of such cases thus far. During a revision of the Malva collection in BP herbarium, several specimens were traced (mostly erroneously labelled as Malva alcea) which demonstrate subspontaneous occurrences of the species, primarily from the Transdanubian region (Hungary). The vouchers are hereby listed, arranged in alphabetical order of localities (settlements). Literary connections, if relevant, are briefly discussed.
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Data on the occurrence of alien plants in Western Transdanubia (Hungary)
185–188Views:760In his publication the author provides data on the occurrence of 11 alien species in Western Transdanubia. Three of these species (Euphorbia maculata, Euphorbia peplus, Muscari armeniacum) were observed to have spread rapidly in the past decade. It can be concluded that 4 species (Artemisia annua, Crocus banaticus, Polycarpon tetraphyllum, Veronica filiformis) have reached a state which is close to naturalization, while the other reported species (Euphorbia lathyris, Senecio inaequidens, Silybum marianum, Veronica peregrina) are casual in this region at present.
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Occurrences of sea lyme grass (Leymus arenarius) in the Kiskunság, Hungary
106-108Views:225We present six new occurrences of a rare non-native species, the sea lyme grass (Leymus arenarius (L.) Hochst.) in the Kiskunság region, Hungary. The populations grow in disturbed, secondary habitats (e.g., abandoned fields, recultivated landfills, surroundings of farms), but one of them begins to expand on the adjacent natural open sandy grassland. Most of the occurrences occupy several hundred square meters and in some cases it forms almost monodominant stands. We suppose that the species has the potential to become an invasive species in this inland sand region.
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Cardamine occulta Hornem. in Hungary, and other stowaways of the ornamental plant trade
195–214Views:441During the study of the weed flora of garden centers in Hungary (among 2017–2020), remarkable populations of Cardamine occulta Hornem., a new alien for the Hungarian flora were found. C. occulta was present altogether in 51 of the 53 visited sites. Dominantly the regularly irrigated and continuously moist microhabitats (pots, containers, muddy surfaces of geotextile-covered beds etc.) were colonized. During the revision of our recently collected specimens, deposited in JPU and DE herbaria as Cardamine hirsuta L., further individuals proved to identical with this till overlooked species. One of them (27.08.2004., Heves county: Eger [8088.3; 8188.1], coll. by A. Schmotzer, deposited in DE collection) proved to the third documented occurrence in Europe, comparing to the accessed literature data. Eclipta prostrata (L.) L. and Urtica membranacea Poir. are also new aliens for the Hungarian flora. Several introduced individuals of these taxa were found in containers of imported thermophilous woody ornamentals at 4 and 2 sites, respectively. Tens of individuals of Eclipta prostrata were also found in a sapling-bed at another site. New populations of scarce or rare Euphorbia prostrata Aiton, E. serpens Kunth and Veronica peregrina L. were also documented.
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Taxonomic revision of alien Ludwigia species in Hungary
153–164Views:258Some tropical Ludwigia species have been planted as ornamentals in Hungarian thermal springs since the 1920s. Although they have become naturalised or even invasive in a few places, their specific identity remained generally uncertain. Our herbarium and field studies revealed that three species of alien water-primroses occur in Hungary. The most frequently planted one is Ludwigia repens, which is, however, a sporadic species in its native distribution area. We have found this species in several parts of the country. Although a few escaped and self-sustaining populations were also observed, this species has appeared to be non-invasive so far. Ludwigia grandiflora appeared in Hungary at the beginning of the 2000s. At the moment it is known from three localities, though spreading rapidly, becoming already invasive in its locality at Tata city. A similar species, L. peploides has recently been reported from two localities, where it forms small stands; the success of its naturalisation can be assessed in the future. We found no evidence for the Hungarian occurrence of L. alterniflora that had been published from Eger city. Therefore we suggest deleting this species from the current Hungarian checklist.
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Escaping of Euphorbia myrsinites from cultivation in Eger (E Hungary)
253–256Views:149Euphorbia myrsinites L. (Euphorbiaceae) is a well-known ornamental plant with native distribution around the Mediterranean Basin, the Black Sea, the Caucasus region and Minor Asia. Its escape from cultivation and its naturalization in Western and Central Europe as well as in North America was reported in many cases. In Hungary, the casual escape of E. myrsinites has been documented more than fifty years ago and new observations were recently reported from different regions of the country. Here, I discuss a new record of the species from the town of Eger (E Hungary). The obtained data allow considering E. myrsinites as a locally naturalized species in the flora of Hungary. According to standardized criteria, the species may be able for local invasions too, but further observations are needed to accurately determine its present status in Hungary.