12. Deyeuxia mazzettii Veldkamp, Gard. Bull. Singapore. 37: 222. 1985 [“1984,” as “mazettii”].
会理野青茅 hui li ye qing mao
Calamagrostis stenophylla Handel-Mazzetti, Symb. Sin. 7: 1298. 1936; Deyeuxia grata Keng; D. stenophylla (Handel-Mazzetti) P. C. Kuo & S. L. Lu (1987), not Jansen (1952).
Perennial, tufted. Culms erect, 20–60 cm tall, ca. 1 mm in diam., 3–5-noded. Leaf sheaths smooth; leaf blades filiform, involute, 10–20 cm, ca. 0.5 mm wide, both surfaces smooth, margins scabrid, apex subacute; ligule 1–3 mm, truncate or lacerate. Panicle loosely contracted, broadly lanceolate, 6–14 × 2–5 cm; branches whorled, 2–4 cm, smooth, lower 1/3–1/2 bare. Spikelets 4–5.5 mm, greenish or purple; glumes lanceolate, subequal or lower glume slightly longer than upper, margins broadly membranous, smooth, lower glume 1-veined, upper glume 3-veined, apex acuminate; callus hairs 1/5–1/4 length of lemma; lemma 3.8–4.8 mm, scabrid, apex minutely 2-toothed or erose; awn sub-basal, long exserted, 8–10 mm, geniculate; palea 2/3–3/4 length of lemma; rachilla 1.5–2 mm, including hairs up to 3.5 mm. Anthers 2–2.5 mm. Fl. Jul–Aug.
* Alpine meadows, shrubby and grassy mountainsides, montane woodlands, sometimes dominant; 2200–3800 m. Sichuan, Yunnan.
The name "Deyeuxia stenophylla var. muliensis L. Liou" (Vasc. Pl. Hengduan Mts. 2: 2236. 1994) belongs here, but was not validly published because no Latin description was provided.
The name Deyeuxia grata was applied to specimens of this species with some spikelets with 2 florets.
Deyeuxia filipes Keng (Calamagrostis filipes (Keng) P. C. Kuo & S. L. Lu ex J. L. Yang) may be based on a hybrid between D. mazzettii and D. flavens.