New Localities of Schoenoplectiella ×osoreyamensis (Cyperaceae)

Abstract

Schoenoplectiella ×osoreyamensis (M.Kikuchi) Hayasaka, a putative hybrid between S. orthorhizomata (Kats.Arai & Miyam.) Hayasaka and S. triangulata (Roxb.) J.Jung & H.K.Choi, hitherto recorded only from Aomori Pref., northernmost Honshu, was newly recorded from Kitashiobara-mura, Fukushima Pref. and Sakata-shi, Yamagata Pref., in northern Japan. Kitashiobara-mura is the southernmost locality of this hybrid species. It is similar to S. ×trapezoidea (Koidz.) J.Jung & H.K.Choi. but distinguished from it by the rather thick and tender culms, many spikelets per inflorescence, and long tepals.