Flora of North America species comparison

20-70 cm, erect or decumbent;

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

60-100 (150) cm, erect from the base, not conspicuously branched;

internodes mostly glabrous, sometimes puberulent below the nodes.

usually shorter than the internodes, glabrous, smooth or scabridulous, usually without necrotic spots, not becoming spirally coiled when old;

ligules 1.2-3(5) mm, membranous throughout, acute, often lacerate;

blades 2-13 cm long, 1.2-2.5 mm wide, flat or loosely involute, scabridulous or glabrous abaxially, scabrous adaxially, usually without necrotic spots.

glabrous or puberulent, rounded basally, becoming fibrous, not flat or spirally coiled, at maturity;

ligules 1.8-5(10) mm, membranous, firm, strongly decurrent, obtuse;

blades 20-50(80) cm long, 2-4 mm wide, flat or involute, smooth abaxially, scabrous adaxially.

numerous, terminal and axillary, 7-20 cm long, 0.3-1.4(3) cm wide, contracted, often lax, nodding, interrupted below;

primary branches 3.5-7.5 cm, ascending or diverging up to 70° from the rachises, spikelet-bearing to the base;

pedicels 1-3 mm, antrorsely scabrous;

disarticulation above the glumes.

15-50(60) cm long, 5-30 cm wide, longer than wide, diffuse;

primary branches 2-20 cm, capillary, spreading 30-100° from the rachises, naked basally, lower branches with 5-20 spikelets;

pedicels 4-50 mm, longer than the spikelets, capillary, flexible, widely divergent at maturity.

2-4 mm, often purplish, borne singly.

3-5 mm, often purplish, sometimes brownish or bronze.

1.2-2.8 mm, shorter than the florets, 1-veined, veins scabrous, apices often erose, unawned or awned, awns to 0.5 mm;

lower glumes 1.2-2 mm, acute to acuminate;

upper glumes 1.5-2.8 mm, acute;

lemmas 2-3.5(4) mm, lanceolate, mostly smooth, scabridulous distally, pubescent on the calluses, lower 1/2 of the midveins, and margins, hairs 0.5-1.5 mm, apices acuminate to acute, awned, awns 10-30 mm, scabrous, sinuous to flexuous;

paleas 1.8-3.4(3.8) mm, lanceolate, sparsely villous basally, apices acuminate to acute;

anthers 0.9-1.5 mm, yellowish.

subequal, 1.5-3.3 mm, shorter than the florets, glabrous;

lower glumes 1-veined, unawned;

upper glumes usually 1-veined, rarely 3-veined, acute to acuminate, often erose, sometimes mucronate;

lemmas 3-5 mm, lanceolate, calluses shortly pubescent, apices acuminate, without setaceous teeth, usually unawned, if, as rarely, awned, awns 1-3 mm, clearly demarcated from the lemma bodies;

paleas 2-4.5 mm, lanceolate, acuminate, unawned;

anthers 1.5-2 mm, purple.

1-2.2 mm, narrowly fusiform, brownish.

2-2.5 mm, narrowly elliptic, brownish.

panicles not present.

= 20, 40.

= unknown.