Flora of North America species comparison

100-180(220) cm, erect;

nodes 9-16, mostly concealed by the leaf sheaths, glabrous.

45-100 cm, erect or decumbent at the base;

nodes glabrous or almost so.

evenly distributed;

sheaths usually glabrous, occasionally villous, often reddish brown;

auricles 1-3 mm, brown;

ligules to 1 mm;

blades (8)10-20(24) mm wide, flat, lax, dark green, adaxial surfaces usually thinly pilose, with weakly spreading hairs on the veins at least near the margins, sometimes villous or glabrous.

evenly distributed over the lower 1/2 of the culms;

sheaths glabrous;

auricles usually present, to 1 mm;

ligules to 1 mm on the basal leaves, 1-3 mm on the flag leaves;

blades 2.5-6 mm wide, lax, abaxial surfaces smooth and glabrous, adaxial surfaces scabrous, with scattered 0.5-1 mm hairs, veins close together.

10-30 cm long, 3-5 cm wide, pendent, the bases often barely exserted, with 2 spikelets per node;

internodes 5-8(12) mm long, 0.2-0.3 mm thick at the thinnest sections, usually pubescent beneath the spikelets.

12-25 cm long, 2.5-6 cm wide including the awns, 10-15 mm wide excluding the awns, flexuous, usually nodding or pendent at maturity, with 1 spikelet per node;

internodes 11-17 mm long, 0.4-1 mm wide, glabrous, mostly smooth, scabrous on the edges.

12-20 mm, divergent, with (3)4-6(7) florets, lowest florets functional;

disarticulation above the glumes and beneath each floret.

14-26 mm long, 6-8 mm wide, appressed to divergent, 1.5-2 times as long as the internodes, with 4-6 florets;

rachillas glabrous;

disarticulation above the glumes and beneath each floret.

equal or subequal, 12-30 mm including the often undifferentiated awns, the basal 0.5-1 mm subterete and slightly indurate, glume bodies 7-12 mm long, (0.2)0.4-0.9(1.1) mm wide, linear-setiform, entire, widening or parallel-sided above the base, 1-3(5)-veined, glabrous, hispidulous or villous, especially near the margins, margins firm, awns (5)8-15(18) mm, straight or flexuous;

lemmas 10-15 mm, usually uniformly appressed-villous, rarely scabrous-hirtellous or glabrous, awns 15-25(30) mm, moderately to strongly outcurving;

paleas 9-14 mm, narrowly truncate, minutely bidentate;

anthers 2-3.5 mm.

narrowly lanceolate, margins about 0.2 mm wide, 3(5)-veined, the bases flat, evidently veined, margins hyaline, widest at about midlength, acute or acuminate, unawned or awned, awns to 4 mm, straight;

lower glumes 5-9 mm;

upper glumes 8-10 mm;

lemmas 8-15 mm, scabrous, rounded on the back, awns 10-25 mm, arcuately diverging;

paleas as long as or longer than the lemmas, tapering, apices truncate, about 0.3 mm wide;

anthers 3-5 mm.

from mid-July to early August.

= 28.

= 28.