Flora of North America species comparison

50-120 cm, glabrous.

4-30 cm, usually erect, sometimes semi-prostrate, glabrous, smooth.

closed for less than 1/3 their length, glabrous, shredding into fibers;

Iigules (0.2)0.5-1.5 mm;

blades 2-8 mm wide, flat or loosely convolute, smooth or scabrous, veins 9-35, ribs obscure;

abaxial sclerenchyma in narrow strands;

adaxial sclerenchyma developed;

girders or pillars usually associated with the major veins.

closed for about 1/2 their length, glabrous, persistent;

collars glabrous;

ligules 0.1-0.3 mm;

blades (0.2)0.3-0.4(0.6) mm in diameter, conduplicate, lax, abaxial surfaces glabrous, adaxial surfaces sparsely scabrous to puberulent, veins 3-5, ribs 1-3;

abaxial sclerenchyma in 3-5 small strands, less than twice as wide as high;

adaxial sclerenchyma absent.

(5)10-20 cm, open, with 1-2 branches per node;

branches lax, ascending to spreading, spikelets clustered towards the ends of the branches, closely imbricate.

1-4(5) cm, contracted, with 1-2 branches per node;

branches erect, lower branches with 2+ spikelets.

4-7(7.5) mm, elliptic to obovate, with 3-5(8) florets.

(2.5)3-5 mm, with (1)2-3(5) florets.

lanceolate to ovate-lanceolate, scabrous at least on the veins;

lower glumes (2.5)3-4(5) mm, usually almost as long as the adjacent lemmas;

upper glumes (3.5)4-5(5.5) mm;

lemmas 4-5(5.2) mm, stiffly chartaceous, ovate to obovate, glabrous, somewhat acute, unawned;

paleas as long as or slightly shorter than the lemmas, intercostal region smooth or scabrous distally;

anthers (0.7)1-2(2.5) mm;

ovary apices pubescent.

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

lower glumes 1.3-2.5 mm;

upper glumes 2-3.5 mm;

lemmas (2)2.2-3.5(4) mm, ovate-lanceolate, sparsely scabrous near the apices, apices abruptly acuminate, awns 0.5-1.5(1.7) mm;

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

anthers (0.4)0.6-1.2 mm;

ovary apices usually with a few hairs, rarely glabrous.

leaf blades 0.7-3.5 cm.

= unknown.

= 28.