A novel triterpenoid saponin from bulbs of Bolbostemma paniculatum Isolation and structural elucidation of a bioactive saponin from tubers of Bolbostemma paniculatum Studies on chemical constituents in bulbs of Bolbostemma paniculatum Chemical Constituents of Bolbostemma paniculatum Effects of Ultraviolet-B Radiation on Active Ingredients and Antioxidant Activities in Fresh Bolbostemma paniculatum Study on tissue culture of Bolbostemma paniculatum