Flora of North America species comparison

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

60-120(150) cm, glabrous, smooth.

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.

closed for about 3/4 their length, slowly shredding into fibers;

collars glabrous;

ligules 0.1-0.3 mm;

blades varying within a plant, blades of the vegetative shoots to 60 cm long, (0.2)0.3-0.6 mm in diameter, conduplicate, veins 3-5(7), ribs 1(3), abaxial surfaces smooth or sparsely scabrous, adaxial surfaces scabrous, cauline blades to 25 cm long, 2-4 mm wide, flat;

abaxial sclerenchyma of the vegetative shoot blades in 3-5 small strands less than twice as wide as high, of the upper cauline blades in 7-11 small strands;

adaxial sclerenchyma absent.

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

branches lax, usually spreading, sometimes reflexed.

6-18 cm, open or contracted, somewhat secund, with 1-2 branches per node;

branches more or less erect, scabrous, lower branches with 2+ spikelets.

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

7-14 mm, with (2)3-6(9) florets.

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.

exceeded by the upper florets; ovate-lanceolate to lanceolate, mostly smooth or scabrous on the upper midvein;

lower glumes 3-5.5 mm;

upper glumes 4-6.5(7) mm;

lemmas (4.7)5-8.5 mm, lanceolate, mostly smooth, sometimes scabrous near the apices, awns 1.5-6 mm;

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

anthers 2.5-4.5 mm;

ovary apices pubescent.

= 28.

= 28.