Systematic Studies of Parasenecio {Asteraceae-Senecioneae) I. Parasenecio katoanus, a New Species from Yamagata Prefecture, Northern Honshu, Japan

摘要

a new species of Parasenecio {Asteraceae-Senecioneae) "P. katoanus Kadota, is described from the Shonai region, Yamagata Pref" northern Honshu, Japan. Parasenecio katoanus is distinguished from P. nikomontanus (Matsum.) H. Koyama by having1) triangular-pentagonal,somewhat fleshy, dimly lustrous, usually glabrous leaf blades, 2) longer involucres with acute involucral phyllaries, 3)longer achenes, and 4) ascending peduncles at an acute angle. It was found that the flowers were fragrant in the midst offlowering time. Parasenecio katoanus is hitherto known only from the Shonai area of Yamagata Pref.