Flora of North America species comparison

50-100 cm, glabrous, somewhat glaucous;

nodes usually exposed.

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

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, 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.

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

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

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

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

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

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

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.