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In this paper, the current diversity and distribution of genus Bupleurum in Bulgaria are presented. Field and herbarium studies have found that in the Bulgarian flora the genus is represented by 17 species (three perennials and 14 annuals) belonging to four sections. A new key for identification of the sections and taxa is provided. For each species, the diagnostic characters are noted down, as well as its closest relatives with which it can be confused. Literature and herbarium data of the species distribution in Bulgaria are summarized and illustrated on the map, with floristic regions and UTM grid. [ABSTRACT FROM AUTHOR]

Circaea alpina is already known in the flora of Bulgaria from Yundola, Lokvensko Dere locality (West Rhodope Mts). However, information on it is based only on a single publication 70 years ago, not documented with any herbarium materials. The species has not been confirmed subsequently for Bulgaria and was evaluated as Data Deficient in the Red List of Bulgarian vascular plants. This paper offers new data on the second established locality of the species in Bulgaria, as well as some information on its ecology and conservation status in the country. The new locality was found comparatively far from the first one, in the Mt Etropolska Divide - part of Central Balkan Range. The discovered population was very small (about 30 individuals) and inhabited some silicate rocky walls. The new record requires reassessment of the conservation status of Circaea alpina in Bulgaria. [ABSTRACT FROM AUTHOR]