20. Agrostis sinorupestris L. Liu ex S. M. Phillips & S. L. Lu, Fl. China. 22: 346. 2006.
岩生剪股颖 yan sheng jian gu ying
Type:China. Yunnan: E slopes of Lijiang Snow Range, Yangtze watershed, 1923-1924, J. F. Rock 10774 (holotype, US-1214302).
Haec species A. rupestri Allioni affinis, sed ab ea arista ex medio (non prope basim) lemmatis exorienti atque antheris brevioribus (0.6–0.8 mm, non 1–2 mm) differt.
Agrostis hugoniana Rendle var. aristata Keng ex Y. C. Yang.
Perennial, densely tufted. Culms erect, slender, 12–20(–30) cm tall, ca. 0.5 mm in diam., 2–3-noded. Leaf sheaths longer or shorter than internodes; leaf blades linear, flat or involute, 3–15 cm × 1–2 mm, scabrid; ligule very short, apex round or truncate. Panicle slightly contracted, lanceolate in outline, 3–8 cm; branches 2–6 per node, up to 4 cm, smooth or sparsely scabrid. Spikelets 2.8–3.5 mm, dark purple; glumes lanceolate, unequal, lower glume ca. 0.3 mm longer than upper glume, keel scabrid, apex acute; callus hairs ca. 0.2 mm; lemma ca. 2 mm, awned from middle of back, apex slightly toothed; awn weakly geniculate, 3.5–5 mm; palea 0.4–0.6 mm. Anthers 0.6–0.8 mm. Fl. and fr. summer and autumn.
* Stony mountain slopes; 3500–4000 m. Sichuan, Xizang, Yunnan.
There is a good illustration of Agrostis sinorupestris in Keng (Fl. Ill. Pl. Prim. Sin. Gram. 545. 1959, as "Agrostis rupestris"). The species is very similar to delicate forms of A. nervosa, but differs by the presence of awns.
The name "Agrostis sinorupestris L. Liou" (Vasc. Pl. Hengduan Mts. 2: 2252. 1994) belongs here, but was not validly published because no Latin description was provided. The name Agrostis rupestris Allioni has been misapplied to this species in the Chinese literature. That species is confined to mountains in Europe and differs by its lower awn insertion on the lemma back (near the base to the lower 1/3) and longer anthers 1–2 mm.