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Studies of the Bulgarian vegetation have started a century ago, but for many reasons for a long time they were defined by the dominant approach. Within the last two decades, many syntaxa occurring in the country have been identified in the result of intensive field work and development of national and international databases, as well as after adoption of the standards of the European vegetation classification. The first complete checklist of the Bulgarian syntaxa under the Braun-Blanquet approach was compiled more than a decade ago and has been in need of updating in compliance with the latest national and international scientific achievements. The current paper aims at compiling an updated checklist of the Bulgarian high-rank syntaxa dominated by vascular plants. According to the results, Bulgarian vegetation features 68 classes, 135 orders and 259 alliances. These syntaxa account for 65% of the European classes, 45% of the orders and 23% of the alliances. A number of uncertain and insufficiently researched units illustrate the knowledge gaps and a need for further studies. [ABSTRACT FROM AUTHOR]

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]

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]