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The distribution of genus Iris subgenus Iris was presented and notes of its taxonomy were given in the paper. Based on the critical processing of the collections in the national herbaria (SOM, SOA and SO), the literature sources, and our field observation we have produced distribution maps. New chorological data are reported for Iris reichenbachii, I. suaveolens, and I. ×germanica. Iris mellita, whose taxonomical status is under investigation, was reviewed as a synonym of I. suaveolens. The distribution of I. aphylla in Bulgaria was not confirmed until now, with the current collection for the Bulgarian flora. [ABSTRACT FROM AUTHOR]

The current study provides detailed information about Rumex kerneri Borbás in the flora of Bulgaria. The data about this species in the floristic literature is contradictory and uncompleted. The morphologically closely allied species R. cristatus DC. и R. patientia L. misleads in the determination of the species. Both species are used as a referent to establish the discrete morphological characters and metrics. The current study provides detailed information about pollen and fruit morphology, leaf epidermis, and karyology of Rumex kerneri Borbás in the flora of Bulgaria. The data about this species in the floristic literature is contradictory and uncompleted. The most reliable characters in the differentiation between R. cristatus are R. patientia the reduced number of flowers in a cluster of R. kerneri, the development of only one tubercle in the mature valves, and the abaxial surface of the leaf blade. Also, the pollen morphology (light and scanning electron microscopy) was confirmed in this study. The somatic chromosome number of the species 2n = 80 is also given. This is the first chromosome number for the taxon from Bulgaria and confirms the earlier reports. [ABSTRACT FROM AUTHOR]

Floristic studies have been carried out in the Upper Thracian Lowland in 14 railway stations: Dimitrovgrad, Knizhovnik, Malevo, Maslinovo, Most, Stara Zagora, Yabalkovo, Uzundzhovo, Harmanli, Skobelevo, Karadzhalovo, Stalevo, Plovdiv and Haskovo during the period 2017 to 2019. A total of 267 species, 174 genera and 53 families of higher vascular plants were identified. Alien and invasive species make up for a relatively high percentage of 9.4% in the railway flora. This indicates that the railway network plays an important role in the penetration and further dispersal of alien species in Bulgarian. The long-distance spread of railway areas is most common with passing trains and people moving. The largest number of alien species were found at stations with more intensive movement of passengers and cargo, where maneuvers are performed, stay of freight trains, such as Dimitrovgrad, Haskovo, Plovdiv, Stara Zagora. The alien species found at several of the studied railway stations were: Convolvulus arvensis L., Erigeron canadensis L., Fallopia convolvulus (L.) Á. Löve, Amaranthus hybridus L., Amorpha fruticosa L. Individual plants of strongly invasive Ambrosia artemisifolia L. have been identified in the railway station in the Haskovo City. [ABSTRACT FROM AUTHOR]

The flora of the Thracian Lowland region was analyzed in 13 target localities (seminatural grasslands) near rapeseed fields for a 3-year period. A total of 245 flowering species were registered in the experimental fields, 178 of them were enthomophyllic plant species. Eleven adventitious and invasive species were recorded in representative experimental fields and their margin. The share of adventive species are small percent of the species composition, but pose a future threat to biodiversity. Maintaining the relative naturalness of these areas has a big role in the nutrition for the pollinators. This study provides data about the identification, observation in the field margins. The collected data could be a base for evaluation of the ecosystem services provided by agrocoenoses and neighboring semi-natural grasslands in the Thracian Lowland. [ABSTRACT FROM AUTHOR]