24. Agrostis vinealis Schreber, Spic. Fl. Lips. 47. 1771.
芒剪股颖 mang jian gu ying
Agrostis canina subsp. montana (Hartman) Hartman; A. canina subsp. trinii (Turczaninow) Hultén; A. canina var. montana Hartman; A. coarctata subsp. trinii (Turczaninow) H. Scholz; A. flaccida subsp. trinii (Turczaninow) T. Koyama; A. flaccida var. trinii (Turczaninow) Ohwi; A. trinii Turczaninow; A. vinealis subsp. trinii (Turczaninow) Tzvelev.
Perennial, tufted, shortly rhizomatous. Culms erect from a geniculate base, 30–60 cm tall, ca. 1 mm in diam., 3-noded. Leaf sheaths smooth; leaf blades narrowly linear, flat or weakly rolled, grayish green, 5–8 cm × 0.5–2 mm, scabrid; ligule 1.5–3 mm, apex obtuse. Panicle lanceolate to narrowly ovate, 7–12 cm; branches 2–5 per node, laxly ascending, slender, moderately scabrid. Spikelets 2–2.5 mm, purple; glumes oblong-lanceolate, subequal, lower slightly longer, keel scabrid or almost smooth on upper glume, apex acuminate; callus hairs ca. 0.2 mm; lemma 2/3 spikelet length, awned from slightly below middle to lower 1/3, or awnless, apex obtuse; awn geniculate, 3–3.5 mm; palea very small. Anthers 1–1.5 mm. Fl. and fr. summer and autumn.
Damp grassy places; 1500–1700 m. Heilongjiang, Jilin, Liaoning, Nei Mongol [Japan, Korea, Mongolia, Pakistan, Russia; America, Europe].
Agrostis vinealis lies at the center of a complex of closely related taxa, including in China A. flaccida and A. turkestanica. Characters separating the taxa are very slight, which has led to differences in opinion as to their taxonomic status. Agrostis vinealis itself is widespread in Eurasia, but other members are usually of more restricted distribution. Agrostis trinii, based on an E Asian element with very scabrid leaf blades, has been reported from NE China. Other characters used to distinguish it are conflicting in the literature, and it seems impossible to maintain it as distinct.