Flora of North America species comparison

50-100 cm, glabrous, somewhat glaucous;

nodes usually exposed.

40-125 cm, glabrous.

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

ligules 0.5-1 mm;

blades 2-10 mm wide, flat, loosely conduplicate, or involute, abaxial surfaces smooth or scabrous, glabrous or puberulent, adaxial surfaces smooth or scabrous, veins 13-35, ribs obscure;

sclerenchyma in abaxial and adaxial strands;

girders formed at most 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.

(8)10-30(40) cm, open, with 1-2 branches per node;

branches lax, spreading, spikelets borne towards the ends of branches.

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

branches lax, spreading.

6-11 mm, sometimes glaucous, with (2)3-5 florets.

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

lanceolate, smooth or scabrous, acuminate;

lower glumes 4-7 mm;

upper glumes 5-7.5 mm;

lemmas 5-8 mm, chartaceous, lanceolate, glabrous, usually smooth, sometimes scabrous towards the apices, apices acute to acuminate, unawned, sometimes mucronate;

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

anthers 2-3 mm;

ovary apices densely 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.