Flora of North America species comparison

50-120 cm, glabrous.

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

nodes usually exposed.

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 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.

(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.

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.

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

7-12 mm, with (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.

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.

= unknown.

= unknown.