Effect of exogenous nitric oxide on seed germination of Oldenlandia diffusa under drought stress Research progress on determination methods of active constituents from Oldenlandia diffusa and its preparations Impact of priming on seed germination and seedling growth of Oldenlandia diffusa under drought stress STUDIES ON BIOLOGY OF THERETRA OLDENLANDIAE AND ITS INJURY TO AMORPHOPHALLUS KONJAC Studies on constituents of Oldenlandia diffusa Nomenclature Clarification of the Traditional Chinese Medicine Baihuasheshecao and Its Adulterants Based on Molecular and Morphological Evidence