Circaea alpina (Onagraceae) – a poorly known species in the Bulgarian flora

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.