Erianthus formosanus Stapf, Kew Bull. Misc. Inf. 1898: 228. 1898. Hsu, Fl. Taiwan 5: 648. 1978.
Saccharum formosanum (Stapf.). Ohwi, Act. Phytotax. Geobot. 11: 152. 1942; Koyama, Grass. Jap. Neighb. Reg. 411. 1987.
Erianthus pollinoides Rendle, Journ. Linn. Soc. 36: 350. 1904.
Erianthus formosanus var. pollinioides (Rendle) Ohwi, Act. Phytotax. Geobot. 11: 152. 1942.
Culm about 2 mm in diameter, more than 70 cm tall. Rhizome elongate.
Blade about 40 cm long by 5 mm wide; ligule chartaceous, truncate, about 1 mm long, hairy on the back. Spikelets paired, monomorphic, the upper pedicellate, the lower sessile, about 3.5 mm long; rachis articulating; lower spikelet falling off together with the rachis-joint. Lower glume subcoriaceous, lanceolate, as long as the spikelet, minutely 2-toothed, lower back sericeous, margins inrolled; upper glume 3-nerved, lanceolate, about 3.2 mm long, margins inrolled and fimbriate, ciliate on back; lower lemma chartaceous, margins inrolled, upper half membranous, fimbriate; upper lemma about 1.8 mm long, linear-lanceolate, fimbriate at the apex, 2-toothed, 1-nerved, ending in an awn of about 7 mm long; upper palea hyaline,lanceolate, ciliate at apex, about 1 mm long.
TAIPEI: Mucha, Kao s. n. Dec. 9, 1956; Shihlin, Odashima s. n, Nov. 16, 1933 HSINCHU: Yulo, Kao s. n. Dec. 25, 1956. MIAOLI: Taan, Hsu 581.KAOHSIUNG: Henry 1143.
Endemic to Taiwan.
A variety,Erianthus formosanus var. pollinioides, with reddish-purple callus hairs was recognized by Ohwi.