ミチノクフクジュソウ（キンポウゲ科）の新産地と核型

We examined an Adonis species occurring in Okayama Prefecture, Western Honshu, Japan. After studying morphological characters and as-certaining of the chromosome numbers, it was determined as A. multiflora Nishikawa and Koji Ito by having hollow scape, sepals shorter than the petals and the chromosome number of 2n=16. Adonis multiflora is newly reported from Okayama Pefecture, and the Adonis plants hith-erto reported from the limestone areas in Chu-goku District（Atetsu Region）are considered to belong to this species. A karyomorphological study of Adonis multi-flora collected from Okayama and Hiroshima Prefectures was carried out. They proved to be diploid with 2n=16 chromosomes, and eight chro-mosome pairs were recognized by configuration of chromosomes : four pairs with median chro-mosomes and remaining four pairs with subme-dian and/or subterminal chromosomes. Among the submedian and/or subterminal chromosomes, two pairs had satellites on the short arms. This is the first report for the karyotype under the name of A. multiflora, and the karyotype is nearly the same as that of materials with 2n=16 underthenameofA. amurensis Regel and Radde by Suda and Herai（1991）