Nevesinjsko Polje is one of the large karst fields of the Dinaric karst (western Balkans). There is a long tradition of floristic research into the Nevesinjsko Polje, starting at the the end of the 19th century. During our field research into the wetland ecosystems of the Nevesinjsko Polje, new and noteworthy chorological data for rare and threatened vascular plant species were recorded: Achillea ptarmica, Drosera rotundifolia, Menyanthes trifoliata and Sanguisorba officinalis. Also, data concerning their habitats and population sizes are presented, and the conservation status of the studied species is assessed as Critically Endangered in Bosnia and Herzegovina. Possible negative anthropogenic influences could threaten the wetland habitats where these species occur, and the paper highlights the need to monitor the population trends of the studied species
