日本産アザミ属の分類学的研究XVI : 1新亜節と東北地方からの4新種

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A new subsection and four new species of the genus Cirsium from the Tohoku District, northern Japan are reported here. Cirsium togaense Kadota is described from the Oga Peninsula, Akita Pref. and characterized by erect capitula, campanulate involucres, 12-13-seriate, strongly recurved involucral phyllaries and oblong glandular bodies on middle and inner phyllaries. Cirsium domonii Kadota is described from the maritime mountains of Akita and Yamagata Prefs. and is characterized by having also erect capitula, subebture abd coarsely serrate cauline leaves and strongly recurved phyllaries with vestigual glandular bodies. Both C. togaense and C. domonii have close relationship to C. umezawanum Kadota described from Rishiri Island, northern Hokkaido. Hence, a new subsection of sect. Onotrophe (Cass.) DC., subsect. Littoralicola Kadota, is proposed for the three species above stated. Cirsium katoanum Kadota is described from Yamagata Pref. and is characterized by having somewhat fleshy cauline leaves, erect ti oblique capitula, narrowly cylindrical to cylindrcal involucres, 11-12-seriate, recurved, undulate involucral phyllaries, obkanceolate glandular bodies and gynodioecy. Cirsium takahashii is also described from Yamagata Pref. and is characterized by erect to oblique capitula, cylindrical involucres, the presence of oblanceolate glandular bodies and gynodioecy. Both C. katoanum and C. takahashianum belong to sect. Onotrophe subsect, Tubelosae.