日本産アザミ属(キク科)の分類学的研究XVIII : 九州産の1新亜節と4新種

概要

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A new subsection and four new species of Cirsium are described from Kyushu, southern Japan. Subsect. Tsukushicola, subsect. nov. (sect. Onotrophe DC.) is characterized by th presence of basal leaves at anthesis, large-sized, nodding heads and the chromosome number of 2n=4x=68. This new subsection is composed of three new species: C. kirishimense fro southern Kyushu is characterized by deeply pinnatilobate leaves, 8-9-seriate involucral phyllaries and longer outer phyllaries, C. kujuense from central Kyushu is characterized by (9-)10-11-seriate phyllaries and gynodioecy and C. unzenense from nothern Kyushu is characterized by shallowly pinnatilobate leaves, 8-9-seriate involucral phyllaries. Additionally C. akimotoi is described from Mt. Shiraiwa-yama, Miyazaki Pref., central Kyushu. C. akimotoi belongs to another subsection, subsect. Suffulta, and is distinguished from C. pseudosuffltum Kadota by deeply pinnatilobate, cauline leaf lobes ascending at an acute angle, larger capitura, longer, spreading (patent) to ascending involucral phyllaries, shorter achenes and linear, vestigial glandular bodies.