Flora of North America species comparison

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

40-70(100) cm, smooth, glabrous throughout;

nodes usually not 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 1/2 their length, glabrous or scabrous, persistent or slowly shredding into fibers;

collars glabrous;

ligules (0.2)0.3-0.5 mm;

blades 1.5-3 mm in diameter, loosely conduplicate to flat, persistent, abaxial surfaces glabrous and smooth, adaxial surfaces scabrous or pubescent on the ribs, veins 7-13, ribs 7-10(13), blades of the lower and upper cauline leaves similar in length and stiffness;

abaxial sclerenchyma in strands opposite and about as wide as the major veins;

adaxial sclerenchyma often present opposite the major veins;

pillars or girders often developed.

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

branches spreading and lax.

8-12(15) cm, loosely contracted, with 1-2 branches per node;

branches lax, spreading or loosely erect, lower branches with 2+ spikelets.

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

8-15(18) mm, with (3)4-6(10) 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.

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

lower glumes (2)3.5-5.5 mm;

upper glumes (4)5.5-7(8) mm;

calluses wider than long, glabrous, sometimes slightly scabrous;

lemmas (5.5)8-10(11) mm, lanceolate, scabrous or puberulent at least distally, attenuate, sometimes minutely bidentate, awns 1-3(3.5) mm, terminal or subterminal, straight, occasionally absent;

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

anthers (3)3.7-5.7 mm;

ovary apices sparsely or densely pubescent.

= 56.

= unknown.