2 Materials and Methods
2.1 Data of the Species occurrence
The distribution data of S. ciliatum , S. nepalense , andS. yunnanense in China were obtained from the National Specimen Information Infrastructure (http:// www. nsii. org. cn/), the National Plant Specimen Resource Center (http://www.cvh.ac.cn/) and the Global Biodiversity Information Fcility (https:www.gbif.org/). The geographical coordinates were not recorded in detail in some distribution points. Thus, Google Earth (http://ditu.google.cn/) was used to obtain the geographical coordinates of the points. Points with repeated latitude and longitude and missing points with latitude and longitude were deleted. In the study, a total of 44, 20, and 16 distribution data samples of S. ciliatum , S. nepalense , and S. yunnanense were gathered and utilized to run the MaxEnt model simulation (Fig. 1).