宽穗扁莎 kuan sui bian suo

Cyperus diaphanus Schrader ex Schultes, Mant. 2: 477. 1824; C. latespicatus Boeckeler; C. latespicatus var. diaphanus (Schrader ex Schultes) Kükenthal; Pycreus latespicatus (Boeckeler) C. B. Clarke.

Annuals. Roots fibrous. Culms densely tufted, 10-35 cm tall, slightly slender, obtusely 3-angled, smooth, with a few leaves basally. Leaves shorter than culm; leaf blade 1.5-2.5 mm wide, apical margin denticulate. Involucral bracts 2 or 3(or 4), leaflike, longer than inflorescence. Inflorescence a simple anthela; rays 2-4, mostly to 7 cm but sometimes short, each with 3-6 spikelets arranged into a spike. Spikelets radiate spreading, narrowly oblong-ovoid to narrowly linear-ovoid, 0.8-2 cm × 3-3.5 mm, compressed, 16-36-flowered; rachilla slightly flexuose, wingless. Glumes dark grayish brown to brown on both surfaces, densely imbricate, broadly ovate, ca. 3 mm, membranous, shiny, 3-veined, keel abaxially green, margin with broad whitish undulate border, apex obtuse. Stamens 2; anthers oblong, 0.8-1 mm. Style long; stigmas 2, shorter than style. Nutlet grayish black, broadly obovoid, 1-1.3 mm, ca. 1/3 as long as subtending glume, biconvex, turgid, transversely undulately striate. Fl. and fr. Sep-Oct.

Water margins, wet places; 600-1800 m. Guizhou, Hainan, Jiangxi, Xizang, Yunnan [Bangladesh, Bhutan, Cambodia, India, Indonesia, Japan, Kashmir, Korea, Nepal, Philippines, Russia (Far East), Thailand, Vietnam].