1. Scirpus orientalis Ohwi, Acta Phytotax. Geobot. 1: 76. 1932.
东方藨草 dong fang biao cao
Scirpus sylvaticus Linnaeus var. maximowiczii Regel; S. sylvaticus var. subradicans Kükenthal ex Tang.
Rhizomes short, stoloniferous. Culms 0.6-1.8 m tall, 7-12 mm thick, obtusely 3-angled, 5-7-nodose. Leaves cauline, as long as or shorter than inflorescence; leaf blade 4-15 mm wide, flat, abaxial midvein and margin usually scabrous. Involucral bracts 2-4, leaflike, much longer than inflorescence. Inflorescence a terminal large compound anthela; rays many, to 10 cm, apically scabrous. Spikelets usually solitary or in clusters of 2 or 3, dark gray, ovoid to narrowly ovoid to rarely ovoid, 4-6 × ca. 2 mm, many flowered. Glumes dark green, broadly ovate, ca. 1.5 mm, with 3 yellowish green veins, apex acute to subrounded. Perianth bristles 5 or 6, as long as or slightly longer than nutlet, erect, retrorsely scabrous. Stamens 3; anthers linear-oblong, ca. 1 mm; connective apex very short. Style slightly longer than nutlet; stigmas 3. Nutlet pale yellow, obovoid to ellipsoid, compressed 3-sided. Fl. Jun-Jul, fr. Aug. 2n = 60.
Swampy places in woods, wet places; 400-2700 m. Gansu, Hebei, Heilongjiang, Jilin, Liaoning, Nei Mongol, Shaanxi, Shandong, Shanxi, Xinjiang [Japan, Korea, Mongolia, Russia (Far East, Siberia)].