Characters comparison of O. fuyunensis and related species A nutlets of O. gmelinii (in adaxial and abaxial view) B nutlets of O. fuyunensis (in adaxial and abaxial view) C flowers of O. fuyunensis D corolla of O. gmelinii E corolla of O. simplicissima F scanning electron micrograph of nutlets of O. gmelinii G scanning electron micrograph of nutlets of O. fuyunensis H scanning electron micrograph of pollens of O. gmelinii I scanning electron micrograph of pollen of O. fuyunensis. Photo by Yi He.