Geographical Distribution of Magnoliaceae Plants in China

The family Magnoliaceae are distributed in tropical,subtropical and temperate zones,concentrating in the areas nearby the tropic zone.There are 11 genera with more or less 121 species,one subspecies,eight varieties and one form in China.Their species richness,species endemic index,similarity coefficient,vertical and horizontal distribution are studied in this paper.The results showed that their species richness center is mostly in Yunnan,Guangdong,Guizhou and Hunan provinces.Otherwise their endemic center is usually in Yunnan,Tibet and Taiwan.Their similarity coefficient is mostly affected by the geographic localities and the different essence of environment.Their vertical distribution center occurs between 1000-2000 m above sea level and its horizontal center limits about 20°-25°N and 90°-100°E.