台灣面積僅36,000平方公里,原生的懸鉤子屬(薔薇科)種類極爲豐富,共有37種。世界的懸鉤子屬植物可分類爲12個亞屬,台灣産Chamaebatus(1種),Malachobatus(16種)及Idaeobatus(20種)等3亞屬。本研究報導台灣産所有原生之懸鉤子屬植物的染色體數,其中19種植物之染色體數爲首次之報導。懸鉤子屬植物之染色體基本數爲x=7,台灣産Chamaebatus亞屬植物爲六倍;Idaeobatus亞屬植物皆爲二倍體;Malachobatus亞屬則包含四倍體、六倍體及八倍體的種類。本研究顯示台灣産Idaeobatus亞屬的全部20種懸鉤子屬植物皆在二倍體的層次進行種化;Malachobatus亞屬Sozostili組全部5種皆在四倍體的層次進行種化。
Taiwan is rich in species of Rubus (Rosaceae), with 37 species known from an island of only 36,000 km^(2). Rubus is classified into 12 subgenera worldwide, of which subgenera Chamaebatus (1 species), Malachobatus (16 species) and Idaeobatus (20 species) occur in Taiwan. In this paper, we document the chromosome numbers of all 37 species of Rubus in Taiwan and cite vouchers for all of them. First counts are here reported for 19 of the 37 species. Based on x=7, Chamaebatus is hexaploid; Malachobatus consists of tetraploids, hexaploids and octoploids; and Idaeobatus is uniformly diploid in Taiwan. Our results indicate that all 20 species of subgenus Idaeobatus in Taiwan have speciated at the diploid level, while the five species of section Sozostili in subgenus Malachobatus have speciated at the tetraploid level.