Flora of North America species comparison

50-120 cm, glabrous.

40-125 cm, glabrous.

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 or pubescent, shredding into fibers;

collars glabrous or pubescent;

ligules 0.1-0.5 mm;

blades 2-6(8) mm wide, flat or loosely convolute, abaxial surfaces glabrous or sparsely pubescent, adaxial surfaces pubescent, veins 13-29, ribs obscure to prominent;

abaxial sclerenchyma in 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.

7-20 cm, open, with 1(2) branches per node;

branches lax, spreading.

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

8-12.5 mm, with (2)3-5 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.

glabrous, lanceolate to subulate;

lower glumes (2)2.5-4 mm;

upper glumes 3.5-5.5(6) mm;

calluses much longer than wide, pubescent at least basally;

lemmas 6-9 mm, lanceolate, puberulent, particularly towards the bases, sometimes slightly scabrous, particularly towards the apices, apices minutely bidentate, awned, awns 10-15 mm, slightly subterminal, flexuous, or kinked;

paleas about as long as the lemmas, intercostal region puberulent distally;

anthers (2)2.5-4 mm;

ovary apices pubescent.

= unknown.

= 28.