Flora of North America species comparison

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

8-25(40) cm, erect, smooth, glabrous or pubescent below the inflorescence.

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 1/2 their length, smooth or scabrous, glabrous or puberulent, persistent;

collars glabrous;

ligules 0.1-0.5 mm;

blades 0.4-0.8(1) mm in diameter, conduplicate, abaxial surfaces glabrous, pubescent, or pilose, all conditions often present on the same plant, scabrous at the apices, adaxial surfaces scabrous or pubescent on the ribs, veins 5-7, ribs 3-5, 1 distinct and 2-4 indistinct;

abaxial sclerenchyma in 3 strands, 2 marginal and 1 opposite the midvein, rarely with 2 additional strands, the strands narrower than the veins and usually less than twice as wide as high;

adaxial sclerenchyma strands absent;

flag leaf blades 0.5-2 cm.

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

branches lax, usually spreading, sometimes reflexed.

2-3.5 cm, racemes or panicles, contracted, with 1(2) branches per node;

branches erect, lower branches usually with 1-2 spikelets.

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

5-6.5(8) mm, with 3-5(6) 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 to lanceolate, glabrous, sometimes scabrous distally;

lower glumes about 3 mm;

upper glumes about 4 mm;

lemmas 4-5 mm, ovate to ovate-lanceolate, glabrous, sometimes scabrous towards the apices, apices acute, awns 0.8-2(2.5) mm, terminal;

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

anthers 2-3.5 mm;

ovary apices glabrous.

= 28.

= 14.