The distribution of the thistle species Cirsium brachycephalum in Tolna county was studied as a part of the Hungarian National Biodiversity Monitoring System. Occurrence data of this endemic species of community importance having been listed as protected since 1993 were scarcely available for Tolna county. In addition to our most recent survey, this paper also provides an analysis of former literature data, and calls the attention that there is a possibility for revealing further valuable botanical information in the less surveyed areas of Tolna county.