Using DNA Barcoding in Genus Tacca (Dioscoreaceae) Effect of Different Preservative Solution on the Vase Life of Cut Flower of Tacca chantrieri Phylogeny and Evolution of Bracts and Bracteoles in Tacca (Dioscoreaceae) Effect of Different Preservative Solution on the Vase Life of Cut Flower of Tacca chantrieri TWO NEW STEOIDAL SAPONINS FROM TACCA PLANTAGINEA ROOT Callus induction and asexual line establishment of Tacca chantrieri Studies on Chemical Constituents of Astragalus chinensis L.