Flora of North America species comparison

50-120 cm, glabrous.

40-100(120) cm, glabrous, erect or slightly decumbent at the base.

closed for less than 1/3 their length, glabrous, shredding into fibers;

Iigules (0.2)0.5-1.5 mm;

blades 2-8 mm wide, flat or loosely convolute, smooth or scabrous, veins 9-35, ribs obscure;

abaxial sclerenchyma in narrow strands;

adaxial sclerenchyma developed;

girders or pillars usually associated with the major veins.

closed for less than 1/3 their length, glabrous, smooth or slightly scabrous, shredding into fibers;

collars glabrous, smooth or slightly scabrous;

ligules 0.1-0.5(0.7) mm;

blades 1.8-6 mm wide, vegetative shoot blades narrower than the cauline blades, flat or loosely conduplicate or convolute, abaxial surfaces glabrous, adaxial surfaces slightly scabrous or pubescent, veins 7-19, ribs obscure to prominent;

abaxial sclerenchyma in narrow strands;

adaxial sclerenchyma developed;

pillars or girders present at the major veins.

(5)10-20 cm, open, with 1-2 branches per node;

branches lax, ascending to spreading, spikelets clustered towards the ends of the branches, closely imbricate.

10-20 cm, open, with 1-2 branches per node;

branches lax, more or less spreading, spikelets borne towards the ends of the branches.

4-7(7.5) mm, elliptic to obovate, with 3-5(8) florets.

(7)7.5-11 mm, with 2-6(7) florets.

lanceolate to ovate-lanceolate, scabrous at least on the veins;

lower glumes (2.5)3-4(5) mm, usually almost as long as the adjacent lemmas;

upper glumes (3.5)4-5(5.5) mm;

lemmas 4-5(5.2) mm, stiffly chartaceous, ovate to obovate, glabrous, somewhat acute, unawned;

paleas as long as or slightly shorter than the lemmas, intercostal region smooth or scabrous distally;

anthers (0.7)1-2(2.5) mm;

ovary apices pubescent.

lanceolate, glabrous, smooth or the apices slightly scabrous, acuminate;

lower glumes 2-4 mm;

upper glumes 3-4.6 mm;

calluses wider than long, smooth or slightly scabrous, glabrous;

lemmas 5.5-7 mm, lanceolate, scabrous or puberulent, minutely bidentate, awned, awns (1.5)2-5(8) mm, subterminal, straight to slightly curved or kinked;

paleas as long as or longer than the lemmas, intercostal region puberulent distally;

anthers (3)3.4-4 mm;

ovary apices pubescent.

= unknown.

= 28.