Ecology suitability study of Lomatogonium rotatum in Inner Mongolia Systematic Study on Lomatogonium A. Br. (Gentianaceae) Glycosides of Lomatogonium rotatum The research on classification and geographical distribution of Lomatogonium in Inner Mongolia Preliminary comparative study of swertiamarin and swertisin on three kinds of Digeda-species Mongolian medicinal materials