Fimbristylis anpinensis Hayata, Icon. Pl. Formosan. 6: 108. 1916; F. ferruginea var. anpinensis (Hayata) H. Y. Liu; F. sieboldii subsp. anpinensis (Hayata) T. Koyama.
Rhizomes well developed, horizontally creeping. Culms ca. 60 cm tall, 1-1.5 mm thick, densely tufted or closely arranged in a row along a ± horizontal knotty rhizome. Leaves mostly reduced to a bladeless sheath but apicalmost sheaths with a setaceous short blade.
Sunny wet places at seashores; near sea level. Taiwan [Japan (Bonin Islands, Ryukyu Islands)].