油芒 you mang

Andropogon cotulifer Thunberg in Murray, Syst. Veg., ed. 14, 903. 1784; Eccoilopus andropogonoides Steudel; E. cotulifer (Thunberg) A. Camus; E. cotulifer var. sagittiformis Ohwi; Eulalia cotulifera (Thunberg) Munro; Miscanthus cotulifer (Thunberg) Bentham; Saccharum cotuliferum (Thunberg) Roberty.

Perennial. Culms solitary, erect, 60–150 cm tall, 3–8 mm in diam., unbranched. Leaf sheaths smooth, papery; leaf blades linear-lanceolate, 15–60 × 0.8–2 cm, scabrid, abaxial surface sparsely hispid, adaxial surface villous above ligule, base narrowed, lower blades pseudopetiolate, apex finely acute; ligule 2–3 mm. Panicle open, ovate-oblong in outline, 15–30 cm; branches capillary, flexuous, 3–10 cm, usually tipped by a single raceme, infrequently branched; racemes 3–10-noded, articulation lines present, shortly bearded, not disarticulating at maturity, spikelets of a pair both pedicellate; rachis internodes 4–7 mm, filiform, apices swollen; pedicels unequal, clavate upward, shorter pedicel stout. Spikelets 5–6 mm; callus hairs ca. 1 mm; lower glume narrowly lanceolate, subglabrous to hispid, veins scabrid, margins densely hispid, apex emarginate, shortly awned to 1.5 mm; upper glume similar; lower floret sterile, palea narrow; upper lemma 2-lobed to middle; awn 12–18 mm. Anthers 2.5–3 mm. Fl. and fr. Sep–Nov. 2n = 40.

Grassy hillsides, valleys, roadsides; 200–1000 m. Anhui, Fujian, Gansu, Guangdong, Guangxi, Guizhou, Hubei, Hunan, Jiangsu, Jiangxi, Shaanxi, Sichuan, Taiwan, Yunnan, Zhejiang [N India, Japan, Kashmir, S Korea].

The spikelets drop very readily at maturity, leaving slender, articulated raceme axes bearing paired, clavate pedicels of distinctive and easily recognizable appearance.