Japan Flora: Annual; culms tufted, about 10 cm. long; leaves 1-2 mm. wide; inflorescence capitate, globular, 1-1.5 cm. wide, the bracts 4 or 5, spreading, to 10 cm. long; spikelets numerous in the head, ovate, 2-3 mm. long, 1.5 mm. wide, slightly flat­tened, obtuse, yellowish green; scales ascending, 2-ranked, ovate-orbicular, obtuse, entire, hyaline, 5- to 7-nerved; achenes 1/2-2/3 as long as the scale, obovate, brownish, obtusely angled, lunate in cross section, the midrib sometimes slightly conspicuous; stigmas 2 or 3.

Honshu (Niigata).