Abstract: Investigated in the present paper was the karyomorphology of Tussilago L. The interphase nuclei were categorized to be the intermediate type between the simple chromocenter type and complex chromocenter type, and the mitotic prophase chromosomes were classified as the intermediate type between the proximal type and interstitial type. The metaphase chromosomes were rather small, ranging from 2.67μm to 1.05μm and the average length was 1.37μm. The karyotype was formulated as 2n=60=40m+8sm+10st+2t with distinct bimodality. The karyomorphological characteristics of Tussilago are disctinct from those of other genera reported in the Senecioneae and seem to be correlated to its unique gross morphology.

Key words: Tussilago, Senecioneae, Karyomorphology