Abstract: Oxytropis prostrata(Pall.)DC.,occurring in eastern Mongolia and eastern Siberia of Russia,was discovered recently in Hulunber of Inner Mongolia,China.It is characterized by the following traits: individuals prostrate,stipules adnate to a petiole or thickly covered with villi,apex of leaflet obtuse to emarginate,beak of keel ca.2 mm long,legumes and ovaries glabrous.