7. Agrostis divaricatissima Mez, Repert. Spec. Nov. Regni Veg. 18: 4. 1922.
歧序剪股颖 qi xu jian gu ying
Agrostis koreana Ohwi.
Perennial, loosely tufted, sometimes shortly rhizomatous. Culms usually many, erect, 40–100 cm tall, ca. 2 mm in diam., 4–5-noded. Leaf sheaths smooth; leaf blades linear, soft, 7–8 cm × 1–3 mm, sharply scabrid on both surfaces, narrowly acuminate; ligule on tillers 2–2.5 mm, on culm leaves 2.5–4 mm. Panicle ovate in outline, 10–25 cm, remaining open after anthesis; branches 6–8 per node, widely spreading, very slender, slightly flexuous, up to 15 cm, sharply scabrid, bare in lower half. Spikelets 1.8–2.3 mm, dark purple; glumes lanceolate, equal, keel of lower glume scabrid above middle, apex acuminate; callus glabrous or nearly so; lemma 2/3–3/4 spikelet length, awnless or sometimes with awnlet up to 1 mm, apex obtuse; palea 1/2–2/3 length of lemma. Anthers 0.8–1.2 mm. Fl. and fr. Jul–Aug.
Riversides, lakesides, marshy meadows, often on saline soils; 500–1500 m. Heilongjiang, Jilin, Liaoning, Nei Mongol [Korea, Mongolia, Russia].
Agrostis mongolica, from Mongolia and Siberia, is very similar, but has a shorter panicle rarely exceeding 12 cm and smaller 1.5–2 mm spikelets. There is some overlap, and it is sometimes placed in synonymy under A. divaricatissima.