20. Deyeuxia purpurea (Trinius) Kunth, Révis. Gramin. 1: 77. 1829.
大叶章 da ye zhang
Arundo purpurea Trinius in Sprengel, Neue Entdeck. Pflanzenk. 2: 52. 1820 ["1821"]; A. langsdorfii Link; Calama-grostis angustifolia Komarov; C. langsdorfii (Link) Trinius; C. langsdorfii var. angustifolia (Komarov) Jaroschenko; C. langs-dorfii subsp. angustifolia (Komarov) Voroshilov; C. langsdorfii var. manshurica (Baranov & Skvortzov) Kitagawa; C. manshu-rica Baranov & Skvortzov; C. purpurea (Trinius) Trinius; C. purpurea subsp. langsdorfii (Link) Tzvelev; Deyeuxia angusti-folia (Komarov) Y. L. Chang (1959), not Vickery (1940); D. langsdorfii (Link) Kunth.
Perennial, tussocky, rhizomatous; rhizomes short or elongate. Culms erect, slender to stout, up to 1.5 m tall, 1–4 mm in diam., usually branched, (4–)6–8-noded. Leaf sheaths smooth, glabrous; leaf blades linear, flat, 10–30 cm, 4–20(–40) mm wide, scabrid; ligule oblong-elliptic, 3–10 mm, obtuse or lacerate. Panicle loosely contracted, narrowly elliptic in outline, 5–20 × 2.5–8 cm; branches slender, ascending or spreading, 2–8 cm, scabrid, bare below middle. Spikelets 3.5–5 mm, yellowish green, purplish, or yellowish brown; glumes lanceolate, subequal, lower glume 1-veined, upper glume 3-veined, scabrid, ciliolate along midvein, apex acute or acuminate; callus hairs equaling or slightly longer than lemma; lemma 3–4 mm, membranous, apex 2-denticulate; awn arising near or above middle of lemma, 1–4 mm, slender, straight; palea 1/2–2/3 as long as lemma; rachilla 0.5–1 mm, including hairs 2–4 mm. Anthers 2–2.5 mm. Fl. Jul–Sep.
Moist meadows, grassy slopes, woodlands; below 100–3600 m. Hebei, Heilongjiang, Hubei, Jilin, Liaoning, Nei Mongol, Shaanxi, Shanxi, Sichuan, Xinjiang [Japan, Korea, Mongolia, Russia; Europe, North America].
Deyeuxia purpurea encompasses a widespread, apomictic complex of morphologically very variable and intergrading forms. These have been treated by different authors either as separate species, or at subspecific or varietal rank within D. purpurea. Most are based on types from outside China, and no attempt is made here to relate these names to variation in the complex within China.
The name Calamagrostis angustifolia refers to a particularly narrow-leaved form (blades 1.5–3.5 mm wide) from NE China.