Flora of North America species comparison

10-80 cm, often geniculate at the base, much branched near the base;

internodes mostly scabridulous or smooth, always scabridulous below the nodes.

(50)80-150 cm, stout, erect, not conspicuously branched;

internodes smooth for most of their length, smooth or scabridulous below the nodes.

often shorter than the internodes, glabrous, smooth or scabridulous;

ligules 1-2 mm, membranous to hyaline, truncate to obtuse;

blades 3-8.5(10) cm long, 1-2.5 mm wide, flat or loosely involute, scabrous abaxially, strigulose adaxially.

shorter or longer than the internodes, glabrous or puberulent, basal sheaths laterally compressed, usually keeled;

ligules 10-25 mm, membranous throughout, acuminate, lacerate;

blades 20-50 cm long, 2-6 mm wide, flat or folded, scabrous abaxially, smooth or scabridulous adaxially.

6.5-13.5 cm long, 1-6.5 cm wide, not dense, often purplish;

branches 1.6-4 cm, ascending or diverging up to 80° from the rachises, spikelet-bearing to the base;

pedicels 2-6 mm, appressed to divaricate, antrorsely scabrous;

disarticulation above the glumes.

20-45 cm long, 3-15 cm wide, loosely contracted to open, light purplish to light brownish;

primary branches 1-17 cm, lax, loosely appressed or diverging up to 70° from the rachises, naked basally;

pedicels 0.5-3 mm, smooth or scabridulous.

2.5-5.5 mm, borne singly.

2.2-3.2 mm.

0.4-1.3 mm, exceeded by the florets, 1-veined, obtuse, often minutely erose;

lower glumes 0.4-1 mm;

upper glumes 0.6-1.3 mm;

lemmas 2.5-3.8(5.3) mm, narrowly lanceolate, mostly smooth, scabridulous distally, hairy on the calluses, lower 1/2 of the margins, and midveins, hairs 0.2-0.5 mm, apices acuminate, awned, awns 10-30 mm, straight to flexuous;

paleas 2.2-4.8 mm, narrowly lanceolate, acuminate;

anthers 0.3-1.2 mm, purplish.

subequal, 2.2-3.2 mm, exceeding the florets, scabridulous to scabrous, faintly 1-veined, acute to obtuse, usually unawned, occasionally awned, awns to 0.2 mm;

lemmas 2-3 mm, oblong-elliptic, shortly pubescent on the lower 1/2 - 3/4, apices acute, usually awned, sometimes unawned, awns to 15 mm, flexuous, purplish;

paleas 1.8-2.9 mm, oblong-elliptic, acute;

anthers 1.2-1.6 mm, yellowish to purplish.

1.7-2.5 mm, fusiform, reddish-brown.

1.3-1.6 mm, fusiform, reddish-brown.

panicles with 1-3 spikelets present in the axils of the lower leaves.

= 20, 40, 60.

= 24, 26, 28, 40, 42, 46, 60, 64.