京都府および近隣地域におけるイナカギクとシロヨメナの分布と形態的・細胞学的特徴について  [in Japanese] Note on the distribution, morphological and cytological features of Aster semiamplexicaulis and A. leiophyllus in Kyoto Prefecture and its adjacent area  [in Japanese]

Aster semiamplexicaulis and A. leiophyllus in Kyoto Prefecture and adjacent area were studied on the morphological and cytological points of view. the both species were characterized by having white ray and L-chromosome karyotype in A ageratoides complex (HUZIWARA, 1957). In the present study, diploid (2n=18), triploid (2n=27) and tetraploid (2n=36) were observed. The diploid plants were characterized by high density of hairs and glands on leaf and truncate or auriculate leaf base, and the tetraploid plants were characterized by low density or absence of hairs and glands and angustate leaf base. However, the plants with the intermediate form of leaf base or intermediate density of hairs and glands were sometimes observed. Only one triploid plant was found in this study and its leaf had high density of hairs and glands. The results of principal component and canonical discriminant analyses show that there is a certain morphological gap between diploid and tetraploid plants. The former is correspondent to A. semiamplexicaulis and the latter to A. leiophyllus. Among the individuals which were thought as intermediate form, the diploid plants were grouped into A. semiamplexicaulis and the tetraploid plants were grouped into A. leiophyllus by the combination of the 13 morphological character. Although the morphological and cytological difference between A. semiamplexicaulis and A. leiophyllus were clear in the present study area, it is necessary to study of those plants in broader area in Japan to conclude the taxonomic treatment of both species.