Classification of Two Phragmites Species, P. australis and P. japonica, in the Lake Biwa-Yodo River System, Japan

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  • ISHII JUN
    Division of Life Science, Graduate School of Science and Technology, Kobe University
  • KADONO YASURO
    Department of Biology, Faculty of Science, Kobe University

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  • 琵琶湖・淀川水系におけるヨシとツルヨシ(イネ科ヨシ属)の分類

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The classification of Phragmites australis (Cav.) Trin. ex Steud. and P. japonica Steud. was reinvestigated using 19 populations from Lake Biwa and Yodo River system, based on principal components analysis of morphological data, phenological observations and chromosome studies. The two species proved to be two distinct taxa, which can be distinguished by characters of the inflorescences, culms and leaves. Hybridization of the two species was improbable because of their temporal reproductive isolation. Ploidy levels were 2n=96 (8x) and 120 (10x) for P. australis and 2n=48 (4x) for P. japonica with x=12. The intermediate forms between P. australis and P. japonica, which had been reported previously, are considered to be variants of one or the other species that show extreme variations in some characters.

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