According to flora division, the loess plateau in the west of Shanxi Province belongs to the Holarctic flora, China-Japan forest plant subregion. North China region and loess plateau subregion. There are 664 species of vascular plants in the flora , belonging to 96 families and 348 genera. The ratios of all the families, genera and species in the Shanxi flora are 56. 8%. 39. 0%. 27. 9% I respectively. And there are as many as 63 families which regional single family and less family, account for 65. 6% of the whole families. This showed that reflects the composition of taxon for the flora was complicated, and the flora was the strong Semi-arid area of North of China characteristics. The analysis on flora's areal-types show that, the main areal-types of this flora was North Temperate, close connection with tropical areal-types and East Asia distributes. There are two new taxon in the record flora. And there are 12 species which are rare and endangered. 3 species, 4 variety plants was not record in the Flora of Shanxi Province. 70% of the plants recources in this flora are available for utilization. Reasonable developing.%晋西黄土高原在植物区系区划中属于泛北极植物区、中国——日本森林植物亚区、华北地区、黄土高原亚地区.全区共有维管束植物664种,分属于96科、348属.科、属、种分别为山西植物区系的56.8％、39.0％、27.9％.菊科、禾本科、蔷薇科、豆科为该区的优势科,共含236种,占总种数的35.5％.而区域性的单种科与少种科多达63科,占到全部科数的65.6％,反映了该区分类群成分的复杂性,具有强烈的北方半干旱区的特点.植物区系的分布区类型分析显示,该区系是以北温带分布为主,与热带分布和东亚分布有紧密联系.在该区系已记录的植物中,有两个新分类群,有12种珍稀濒危植物,有7种、4变种为《山西植物志》未记载的植物.该区可供开发利用的植物资源达70％之多,合理开发、利用、保护这些植物资源,对实现经济与社会的可持续发展十分必要.
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