Flora of North America species comparison

50-100 cm, glabrous, somewhat glaucous;

nodes usually exposed.

(35)50-100(120) cm, erect or decumbent at the base, scabrous.

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 73 their length, glabrous or sparsely pubescent, shredding into fibers;

collars glabrous;

ligules 0.2-0.6(1) mm;

blades 3-10 mm wide, flat or loosely convolute, abaxial and adaxial surfaces scabrous or puberulent, veins 13-29, ribs obscure;

sclerenchyma in narrow abaxial and adaxial strands;

pillars or girders formed 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.

10-40 cm, open, with 1-2(5) branches per node;

branches lax, usually spreading, sometimes reflexed.

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

6-12 mm, with (2)3-5(6) 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.

sparsely scabrous towards the apices, acuminate to subulate;

lower glumes (1.8)2-3(4) mm;

upper glumes (2)3-6 mm;

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

lemmas 5-9 mm, glabrous, sometimes sparsely scabrous, lanceolate, apices entire, acute to acuminate, awned, awns (2.5) 5-15(20) mm, terminal, straight, sometimes curved or kinked;

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

anthers 1.5-2.5(3) mm;

ovary apices pubescent.

= unknown.

= 28.