Flora of North America species comparison

30-150 (200) cm, glabrous or pubescent, sometimes scabrous.

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

closed for less than 1/3 their length, persistent, glabrous or pilose, smooth or scabrous, sometimes scabrous or pilose only distally or on the distal margins;

collars usually densely pubescent or with a few hairs at the margins, sometimes glabrous;

ligules 0.2-5 mm, usually ciliate, abaxial surfaces puberulent;

blades 1-6.5 mm wide, conduplicate, convolute, or flat, 0.5-2(2.5) mm in diameter when convolute, deciduous, abaxial surfaces scabrous or smooth, glabrous or the bases pubescent, adaxial surfaces puberulent to pubescent, veins 9-15(17), ribs (3)5-15(17);

abaxial sclerenchyma forming more or less continuous bands, sometimes reduced to small strands;

adaxial sclerenchyma sometimes present;

girders or pillars present at most 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.

10-25(30) cm, open, with (1)2(4) branches per node;

branches spreading and lax.

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.

8-18(20) mm, borne towards the ends of the branches, with 3-6(8) florets.

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

lanceolate, glabrous or sparsely scabrous at the apices;

lower glumes (4)4.5-6.7(8) mm;

upper glumes (5)6-10 mm;

lemmas (7)7.5-11 mm, lanceolate, scabrous, puberulent, sometimes minutely bidentate, acute, usually awned, rarely unawned, awns (1)2-3(4) mm;

paleas shorter than to longer than the lemmas, pubescent or glabrous on the margins, intercostal region usually puberulent distally;

anthers (3)4-7.5(8.5) 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.

= 56.

= unknown.