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Populations of Bouché’s star of Bethlehem (Ornithogalum boucheanum (Kunth) Asch., fam. Hyacinthaceae) were recorded on Bansko Hill (Baranja, Croatia) in 2007. Since this species has not been previously confirmed in Croatia, it should be treated as a new taxon in the country and included in the Flora Croatica Database. In this paper we present a short morphological description of O. boucheanum and diagnostic morphological characters for differentiation from the related O. nutans L. We suggested O. boucheanum be evaluated as a critically endangered (CR) species of the Croatian flora, considering the small number of individuals and the small extension of its population. The recording of its populations on the edge of the loess cliff in Bansko Hill a part of which belongs to the Important Plant Area and Natura 2000, confirms the significance of this unique habitat in preserving rare and endangered plants.