8. Schoenoplectus chuanus (Tang & F. T. Wang) S. Yun Liang & S. R. Zhang, Novon. 20: 170. 2010.
曲氏水葱 qu shi shui cong
Scirpus chuanus Tang & F. T. Wang, Fl. Reipubl. Popularis Sin. 11: 222. 1961.
Rhizomes short, creeping. Culms laxly tufted, 66-76 cm tall, ± stout, 3-angled, distinctly channeled, smooth, clothed at base with 2 or 3 leaf sheaths. Leaf sheaths to 25 cm; basal sheaths dark brown, with prominent transverse veins; apical sheaths green to greenish brown, mouth obliquely truncate with hyaline margin. Involucral bract 1, erect to obliquely spreading, culmlike, 5-9 cm, 3-angled, smooth. Inflorescence a pseudolateral head, with ca. 10 spikelets. Spikelets oblong to ellipsoid, 5-10 × 3-5 mm, densely many flowered. Glumes brown with dark brown short lines, broadly ovate, 2.5-3 mm, concave, papery, many veined, margin hyaline, apex rounded with a yellowish green costa excurrent into a mucro. Perianth bristles 6, 1/4-1/3 as long as nutlet, glabrous. Stamens 3; anthers narrowly deltoid, apex obtuse; connective apex slightly dilated. Style short; stigmas 3, slender. Nutlet black at maturity, obovoid, 1.5-2 mm, 3-sided, shiny. Fl. and fr. Jul-Aug.
● Shallow water. Jiangsu (Nanjing).