Flora of North America species comparison

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

60-100 (150) cm, erect, glabrous;

nodes usually exposed.

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 scabrous, shredding into fibers;

ligules 0.3-1.5 mm;

blades 3-6(10) mm wide, flat, lax, margins scabrous, abaxial and adaxial surfaces glabrous, adaxial surfaces sometimes scabrous, veins 13-25, ribs obscure;

abaxial sclerenchyma in narrow strands;

adaxial sclerenchyma developed;

girders or pillars formed at the major veins.

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

branches spreading and lax.

10-20(40) cm, open or somewhat contracted, with 1-2(3) branches per node;

branches lax, more or less spreading, spikelets borne towards the ends of the branches.

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

7-12 mm, with (2)3-5 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.

lanceolate, scabrous at least on the midvein, acute to acuminate;

lower glumes (1.5) 2.5-4(4.5) mm;

upper glumes (3)4-6.5 mm;

calluses wider than long, glabrous, smooth or slightly scabrous;

lemmas (5)6-8(9) mm, lanceolate, scabrous or puberulent, acuminate, unawned or awned, awns to 2 mm;

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

anthers 1.6-2.5 mm;

ovary apices pubescent.

= 56.

= unknown.