沼生水莎草 zhao sheng shui suo cao

Juncellus limosus (Maximowicz) C. B. Clarke; Pycreus limosus (Maximowicz) Schischkin.

Annuals. Roots fibrous. Culms tufted, 10-30 cm tall, compressed triquetrous, smooth, with few leaves. Leaves usually shorter to rarely slightly longer than culm; sheath slightly long; leaf blade 2-3 mm wide, usually folded, sometimes flat. Involucral bracts 3 or 4, leaflike, several times as long as inflorescence. Inflorescence a simple anthela, subcapitate; rays 3-6, very short, each with many spikelets congregated into a small capitulum. Spikelets narrowly oblong to oblong, 3-4 × ca. 1.5 mm, 10-18-flowered; rachilla wingless. Glumes straw-colored to sometimes pale rusty brown on both surfaces, slightly laxly imbricate, oblong, ca. 1 mm, membranous, 3-veined, apex obtuse and mucronate. Stamens 2; anthers ellipsoid, short. Style long; stigmas 2, exserted. Nutlet yellowish, oblong, ± as long as subtending glume, plano-convex. Fl. and fr. Aug-Sep.

Wet sandy places at river or lake margins. Heilongjiang [Russia (Far East), Vietnam].