Comparative and phylogenetic analyses of plastid genomes of the medicinally important genus (Alismataceae).

L. is a medicinally important genus of aquatic and wetland plants consisting of c. 10 recognized species.

[Research on contents of anthraquinones,dianthrones and tannins in Rheum tanguticum on PCA and CA].

Anthraquinones,dianthrones and tannins are the main active ingredients of Rheum tanguticum. In this study the three components were determined by HPLC,and the results were analyzed by multiple comparisons,principal components analysis(PCA)and correspondence analysis(CA). The results showed that the contents of components in different growing areas and types(wild and cultivated) reached a significant level(P<0.