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Yellow Water-Lily (Nuphar lutea) is a well-known aquatic plant for the flora of Bulgaria. However, presently it has very limited distribution. Many former localities have disappeared during the last century. This paper provides current data on some important populations of the species in Northwest Bulgaria, the municipalities of Byala Slatina and Boychinovtsi, and presents information on its distribution and syntaxonomy in the country. [ABSTRACT FROM AUTHOR]

Elodea nuttallii (Hydrocharitaceae) is an aquatic plant, native to North America. In Bulgaria, the species was recorded as a naturalised alien relatively recently - in 2002. Since then, the number of the recorded localities has increased rapidly. In Europe, the species has been considered to have high ecological impact in the invaded areas, and therefore, it is included in the List of invasive alien species of EU concern under Regulation (EU) No 1143/2014 of the European Parliament and of the Council of 22 October 2014 on the prevention and management of the introduction and spread of invasive alien species. Article 24(1) of the same Regulation obliges the EU Member States to report by 1st June 2019, and every six years thereafter, the distribution of the invasive alien species of Union or regional concern. Therefore, the reporting of all known localities of Elodea nuttallii in Bulgaria is urgently needed. The article presents the currently known distribution of the species, including a UTM-distribution map, and provides some comments about the information gaps in the chorological information which are relevant to the control of the invasion of this species in Bulgaria. [ABSTRACT FROM AUTHOR]

Determination of stocks of aboveground phytomass of reed communities in Bulgaria is not well studied yet. This survey is the most detailed study on the stocks of the aboveground phytomass of the reed communities (Phragmites australis (Cav.) Trin. Ex Steud.) in Bulgaria. The studied reed beds are formed in the floodplain part of the Danube River. They are located in the fluvial terrace of the river between Archar Village (west) and Srebarna Village (east). As a result of the survey, it was found that the average stocks of the aboveground phytomass of the reed communities reached to 19.78 t/ha. Moreover, 54.04% of the aboveground phytomass is concentrated in the stems of the reed plants. Almost 42% of it is produced by the leaves, and the inflorescences produce less than 5% of the total amount of the phytomass. This study once again demonstrates the important role of reed beds for the normal functioning and development of riparian ecosystems. [ABSTRACT FROM AUTHOR]

This paper presents the results of the first phytocoenological analysis of psammophytic semi-ruderal vegetation on the alluvial terraces of River Maritsa in the Thracian Lowland, Bulgaria. During the field study, new syntaxa for Bulgaria have been found. The new alliance for Bulgaria, Salsolion ruthenicae (class Digitario sanguinalis-Eragrostietea minoris), is represented by the association Erysimo diffusi-Cynodontetum dactylontis, which is widespread on the sand deposits in the river's floodplain. A comparatively high level of ruderalisation influences the communities on the alluvial sands. The species composition of the communities reveals a mixture of perennial species (Cynodon dactylon, Bothriochloa ischaemum, Eryngium campestre), annual psammophytes (Plantago arenaria, Silene conica, Lomelosia argentea) and nitrophilous species, including neophytes (Portulaca oleracea, Tragus racemosus, Erigeron canadensis). The communities in this association differ from those in Central Europe and this has prompted the description of a new subassociation (Poaetosum bulbosae). [ABSTRACT FROM AUTHOR]

Marsh Fern (Thelypteris palustris) is a hygrophytic plant uncommon to the flora of Bulgaria. It is also a vulnerable species, with small and isolated localities in several parts of the country. This paper provides new data on syntaxonomy of the communities in which this fern participates, as well as on a new important locality near Pleven town, Danubian Plain. The paper also attempts to summarize the published and more recent information on the distribution of this species in Bulgaria. [ABSTRACT FROM AUTHOR]