Description from Flora of China
Fimbristylis didrichsenii Boeckeler.
Perennials. Rhizomes short. Culms tufted, 25-60 cm tall. Leaves shorter than culm; leaf blade 1.5-2.5 mm wide, nearly glabrous, margins often involute, apex obtuse. Involucral bracts 2 or 3, leaflike, basalmost usually longer than inflorescence, apex obtuse. Inflorescence a compound, decompound, or simple anthela; rays 3-6. Spikelets solitary, narrowly oblong, oblong, oblong-ovoid, or ovoid, 0.6-2 cm, apex acute to obtuse. Glumes broadly ovate and boat-shaped, ca. 3 mm, glabrous, with 3-5 brown to pale brown veins, apex mucronate. Stamens 3. Style slightly longer than nutlet, basally slightly broader, apically ciliate; stigmas 2. Nutlet pale brown to brown, sessile, globose-obovoid, 1.2-1.5 mm, biconvex, with hexagonal reticulation. Fl. and fr. Aug-Sep.
Wet places on seashores, base of hills; near sea level to 600 m. Fujian, Guangdong, Guangxi, Jiangsu, Liaoning, Shaanxi, Shandong, Yunnan, Zhejiang [Japan, Korea, Myanmar].