Uncarine C (Fig. 1) and its isomers D and E were isolated from Uncaria florida VIDAL (collected in Formosa, Japanese name "Togesoheba"), Uncarine A and B (Fig. 1) from U. Kawakamii HAYATA (collected in Formosa), and rhynchophylline and isorhynchophylline from U. rhynchophylla Miq. (collected in Japan) were isolated. Isolations of these substances are interesting from chemotaxonomical view.