Özet:
This study determines the anatomical and palynological characteristics of the endemic Onosma mersinana Riedl, Binzet & Orcan (Boraginaceae). The examined species is perennial and collected from Mersin vil. The root of examined species observed as secondary structure. Stem pith consist of paranchymal cells. Some pith cells contain crystals. In transverse sections, the leaves are isolateral (=equifacial) in type. The pollen type is syncolporatae. Pollen shape is prolatae P/E: 1.39 (W); subprolatae P/E: 1.22 (E).
