Abstract: Investigated in the present work was the karyomorphology of 6 populations of 4 species in Sinacalia and Parasencio. The interphase nuclei were categorized to be the complex chromocenter type, and the mitotic prophase chromosomes were classified as the imterstitial type in all 4 species. The karyotypes of 2 populations of Sinacalia tangutica were formulated as 2n=60=44m+16sm(4SAT) and =60=42m+18sm (2SAT)respectively. The karyotypes of 3 species of Parasencio were found to be; 2n=60=50+10sm for P.latipes, 2n=60=50m+10sm(2SAT)for P.roborowskii and 2n=60=44m+16sm (2SAT)and 2n=60=44m+16sm for 2 populations of P.deltophylla. All karyotypes were classified as the 2A type. Sinacalia and Parasenecio are distinctly distinguishable in the gross-morphology, but their karyotypes are similar to each other.

Key words: Sinacalia