Elymus antiquus

Description

Culms tufted at base,slender,50–100 cm tall,3–5-noded,glabrous or scabrous below spike.Leaf sheath smooth or scabrous to sparsely hairy,margin sometimes ciliate;ligule 0.2–0.5 mm;leaf blade flat,6–15 × 0.25–0.8 cm,both surfaces scabrous or pubescent.Spike ± nodding at flowering,distichous,7.5–21 cm;rachis glabrous or ± scabrous on back and margin.Spikelets 1 per node,subsessile,green or purplish,20–40 × 2–6 mm,with 3–7(–9) developed florets.Glumes oblong,lanceolate,or subovate,scabrous abaxially or only along veins,margin narrowly hyaline,apex mucronate;proximal glume 1.5–3 × 0.5–1.2 mm,2- or 3-veined;distal glume 3–5.5 × 0.6–1.5 mm,3–5-veined.Lemma lanceolate,8–11.5 × 1.2–1.8 mm,glabrous,pubescent,or densely so abaxially;awn straight or slightly curved,1–2 mm at maturity;callus setulose to densely so.Palea slightly shorter than lemma,scabrous-pubescent to pubescent adaxially,ciliate along keels distally,apex obtuse.Anthers yellow or purple,2–3 mm.Fl.and fr.Jun–Jul.2N = 28*.