Article

The genus Olymposciadium Wolft (Umbelliferae) is represented by only one species (O. caespitosum (Sm.) Wolff ) in the Flora of Turkey. It was collected from Karabik province. In this study. morphological and anatomical features of the plant are described. It is a caespitose-perennial with 30-55 cm height. Leaves mostly basal, oblong, I-pinnate or pinnatisect. Umbels usually equal, 6-14 rayed. Petals white, yellow-striated in the middle. Fruit glabrous, oblong. Stem is often ribbed. The secretory canals are embedded in paranchyma tissuc. Isolated bundles sepa- rated from one another by ground tissue. Leaf is bifacial. Mesophyll s differentiated into 2-seri- ate palisade and 3-5- e. The different types of stomata (anisocytic, diacytic and paracytic) are observed. Each mericarp has four vittae on the dorsal surface and two to four on the comissural; numerous inconspicuous vittae also present. Ridges are inconspicuous.