Floral morphogenesis of Caltha and Trollius (Ranunculaceae) and its systematic significance A New Variety of Caltha palustris from Eastern China Cytology of Two Species in the Genus Caltha (Ranunculaceae) from China Restoration of the Specific Status of Caltha rubriflora and a New Ally Molecular phylogeny and historical biogeography of Caltha (Ranunculaceae) based on analyses of multiple nuclear and plastid sequences New Triterpenic Glucoside from Beesia calthaefolia  (Maxim.) Ulbr. Native to China