Breeding and extension of Pseudostellaria heterophylla new variety "Shitai No.1" in Guizhou province Comparative analysis of main agronomic traits and interrelationships in cultivation provenances of Pesudostellaria heterophylla from Guizhou province Study on seed quality test and quality standard of Pesudostellaria heterophylla Genetic diversity and quality analysis of cultivated Pesudostellaria heterophylla