Southernmost Localities of Schoenoplectus orthorhizomatus (Kats. Arai & Miyam.) Hayas. & H. Ohashi (Cyperaceae) and Its Habitats

Abstract

Schoenoplectus orthorhizomatus (Kats. Arai & Miyam.) Hayas. & H. Ohashi (Cyperaceae), which has been known in northern Japan, is newly recorded from Oze, Mt. Hotaka and the Madarao Highland, in central Honshu, Japan. The species is distributed in areas covered with heavy-snowfall in winter from Hokkaido to central Japan. The species mainly grew in disturbed stands of fen, such as streamside of peatland, foot of peat plateau and trampled ground, while S. hondoensis (Ohwi) Soják, a close relative of S. orthorhizomatus, mainly grew in pools (undisturbed stands) of bog.