Lachnagrostis rudis subsp. rudis

Glabrous, loosely tufted annual or short-lived perennial, culms weakly ascending, to 80 cm high. Leaf-blades flat, to 15 cm long and 5 mm wide; ligules obtuse, 1–3 mm long. Inflorescence a very sparse, open panicle, to 25 cm long with capillary branches. Spikelets 1.5–2.5(–3) mm long, pale green, rarely slightly purplish; glumes equal or the lower slightly longer, keeled, scabrous along the keel and often minutely scabrous along the sides; lemma 1.1–2.2 mm long, acute or obtuse, minutely irregularly fringed and sometimes 4-toothed at apex, slightly shorter than the glumes, firmly membranous, shining, glabrous except for the short callus, occasionally with a short awn attached just below apex, awn 0.1–1.4 mm long; palea slightly shorter than lemma; rachilla bristle plumose, about one-half as long as lemma; anthers c. 0.3–0.6 mm long.