Preparation, in vitro evaluation of excipient-free dry powder inhalation of extraction of Trollius chinensis A study on the plot minimum area and shape for sampling Trollius chinensis yield Effects of vitexin on cell growth and apoptosis of human esophageal cancer EC-109 cells HPLC fingerprint of stems and leaves of Trollius chinensis HPLC fingerprint of stems and leaves of Trollius chinensis Dynamic changes of total flavonoids and orientin from stems and leaves of Trollius chinensis at different collecting periods Dynamic changes of total flavonoids and orientin from stems and leaves of Trollius chinensis at different collecting periods Quality testing and quality classification standard establishment of Trollius chinensis seeds Studies on cultivating technology of Trollius chinensis in Beijing plain area Effects of shading on the photosynthetic characteristics and anatomical structure of Trollius chinensis Bunge Effects of vitexin on cell growth and apoptosis of human esophageal cancer EC-109 cells Effect of Storage Methods on Breaking Seed Dormancy of Trollius chinensis Bge.