Flora of North America species comparison

(35)50-90 (100) cm, erect, glabrous, smooth.

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

closed for less than 1/2 their length, glabrous, hirsute, or scabrous, persistent;

collars glabrous;

ligules 0.1-0.5 mm;

blades 0.5-1(1.2) mm in diameter, conduplicate, abaxial surfaces glabrous or puberulent, adaxial surfaces sometimes scabrous, glabrous or pubescent, veins (5)7-9, ribs 5-9, well defined;

abaxial sclerenchyma in 5-7 wide strands, sometimes confluent into a single band;

adaxial sclerenchyma absent.

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.

(7)8-20(25) cm, loosely to densely contracted, with 1-2 branches per node;

branches erect to slightly spreading, lower branches with 2+ spikelets.

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

branches lax, usually spreading, sometimes reflexed.

9-13.5 mm, with 4-6 florets.

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

exceeded by the upper florets, ovate-lanceolate, smooth or scabrous distally;

lower glumes (2)2.5-5 mm;

upper glumes 4-6.2 mm;

lemmas 5-7(8.2) mm, scabrous near the apices, awns (2)3-5 mm, terminal, usually more than 1/2 as long as the lemma bodies;

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

anthers (2.6)2.8-3.6(4) mm;

ovary apices glabrous.

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.