Flora of North America species comparison

50-100 cm, glabrous, somewhat glaucous;

nodes usually exposed.

45-80 cm, erect or the bases decumbent, scabrous near the inflorescence.

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 or finely scabrous;

collars glabrous;

ligules 3-5(8) mm;

blades 1-3 mm wide when flat, 0.6-1.2 mm in diameter when conduplicate, persistent, abaxial surfaces glabrous, smooth to sparsely scabrous, adaxial surfaces scabrous, veins (5)7-9, ribs 5-9;

abaxial sclerenchyma in strands opposite the veins, rarely a discontinuous band;

adaxial sclerenchyma sometimes present;

girders sometimes present at the major veins;

pillars usually present if the girders not developed.

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

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

6-10(16) cm, contracted or loosely open, with 1-2(3) branches per node;

branches erect or spreading, lower branches sometimes reflexed, spikelets borne towards the ends of the branches.

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

6-8.5 mm, with 2-3(4) 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.

scabrous, acute;

lower glumes 3-4(5.5) mm;

upper glumes 3.5-5.5(6.5) mm;

lemmas 4-6.5 mm, ovate-lanceolate, glabrous, smooth or sparsely scabrous towards the apices, unawned;

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

anthers 1.5-2.6 mm;

ovary apices pubescent.

= unknown.

= unknown.