Flora of North America species comparison

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

40-100(120) cm, glabrous, erect or slightly decumbent at the base.

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, smooth or slightly scabrous, shredding into fibers;

collars glabrous, smooth or slightly scabrous;

ligules 0.1-0.5(0.7) mm;

blades 1.8-6 mm wide, vegetative shoot blades narrower than the cauline blades, flat or loosely conduplicate or convolute, abaxial surfaces glabrous, adaxial surfaces slightly scabrous or pubescent, veins 7-19, ribs obscure to prominent;

abaxial sclerenchyma in narrow strands;

adaxial sclerenchyma developed;

pillars or girders present at the major veins.

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

branches spreading and lax.

10-20 cm, open, with 1-2 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)7.5-11 mm, with 2-6(7) 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, glabrous, smooth or the apices slightly scabrous, acuminate;

lower glumes 2-4 mm;

upper glumes 3-4.6 mm;

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

lemmas 5.5-7 mm, lanceolate, scabrous or puberulent, minutely bidentate, awned, awns (1.5)2-5(8) mm, subterminal, straight to slightly curved or kinked;

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

anthers (3)3.4-4 mm;

ovary apices pubescent.

= 56.

= 28.