Flora of North America species comparison

10-60(100) cm, decumbent-ascending, bases somewhat compressed-keeled;

internodes glabrous, shiny below the nodes.

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

internodes mostly glabrous, sometimes puberulent below the nodes.

glabrous, margins hyaline;

ligules 0.2-1 mm, firm, truncate, ciliate, without lateral lobes;

blades 2-7(11) cm long, 1-2.8(4) mm wide, flat, occasionally conduplicate, smooth or scabridulous abaxially, scabridulous adaxially, margins and midveins not conspicuously thickened, greenish, apices acute, not sharp.

glabrous or puberulent, basal sheaths rounded, often becoming fibrous, but never spirally coiled, at maturity;

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

blades 10-35(80) cm long, 2-4 mm wide, flat or involute, smooth abaxially, scabrous adaxially.

6-21 cm long, 4-16 cm wide, broadly ovoid, open;

primary branches 3-12 cm, capillary, lower branches spreading 30-90° from the rachises, never appearing fascicled;

pedicels 3-14 mm, longer than the spikelets.

15-50(60) cm long, 5-30(41) cm wide, longer than wide, diffuse;

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

pedicels 10-40(50) mm, longer than the spikelets, capillary, flexible.

1.2-2.1 mm, occasionally with 2 or 3 florets.

3-5 mm, usually purple, occasionally green, brown, or stramineous.

equal, 0.6-1.7 mm, purplish, scabridulous, particularly on the veins, 1-veined, apices acute;

lemmas 1.2-2.1 mm, lanceolate to oblong-elliptic, somewhat plumbeous, glabrous, usually smooth, occasionally scabridulous near the apices, apices acute, unawned or mucronate, mucros to 0.3 mm;

paleas 1.2-2.1 mm, lanceolate, glabrous, acute;

anthers 1-1.3 mm, greenish-yellow to purplish at maturity.

subequal, (0.3)1-1.5(2) mm, usually less than 1/2 as long as the lemmas, glabrous;

lower glumes 1-veined, usually unawned, rarely awned, awns 1-3 mm;

upper glumes 1-veined, rarely 3-veined, acute to acuminate, often erose, usually unawned, rarely awned, awns 1-3(5) mm;

lemmas 3-5 mm, lanceolate, not shiny, calluses shortly pubescent, apices scabrous, acuminate, sometimes with 2 setaceous teeth, teeth to 1 mm, unawned or awned, awns 2-13(18) mm, clearly demarcated from the lemma bodies;

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

anthers 1.5-2 mm, purple.

0.8-1 mm, fusiform, brownish.

2-2.5 mm, narrowly elliptic, brownish.

= 20, 22, 28.

= unknown.