Abstract
There are found 11 karyotypes among 160 clones of Disporum sessile collected from Ehime, Kochi and Kagoshima Prefectures. Its basic chromosome set consists of 8 chromosomes which are classified into 2 large groups: group-L including 4 large chromosomes, L1-4, and group-S including 4 small chromosomes, S1-4. The L2- and the S4-chromosome are of submedian type and the others of subterminal type. The 11 karyotypes are different from one another not in fundamental feature but in number and position of satellite. The satellites are usually faintly stained. A decrease in chromosome size seems to occur through releasing a satellite which was originated from a distal part of chromosome arm.
