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

摘要： 4种植物的染色体间期均为复杂型，前期染色体为中间 型。华蟹甲草两居群的染色体数目及核型为2n=60=44m+16sm(4SAT)和2n=60=42m+18sm(2SAT) 。蟹甲草属3种：阔柄蟹甲草为2n=60=50m+10sm；蛛毛蟹甲草为2n=60=50m+10sm(2SAT)；三 角叶蟹甲草两居群分别为2n=60=44m+16sm(2SAT)和2n=60=44m+16sm。核型均为2A型。尽管华 蟹甲草属与蟹甲草属在外部形态上差别较大，但核型上却较为相似

关键词: 华蟹甲草属, 蟹甲草属, 千里光族, 核型