The endemic Onosma bracteosum Hausskn. & Bornm. (Boraginaceae) was investigated morphologically, anatomically and ecologically. It has setae with tuberculate bases. The stem is 15-35 cm tall and erect. The leaves are equifacial and amphistomatous. Stomata cells are anisocytic and anomocytic. | The morphological, anatomical and ecological properties of endemic Onosma bracteosum Hausskn. & Bornm. (Boraginaceae) species