Flora of North America species comparison

50-120 cm, glabrous.

(40) 50-100(150) cm, glabrous, erect or decumbent at the base.

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 sparsely pilose, shredding into fibers;

ligules (0.2)0.5-1(2) mm;

blades (3)5-10 mm wide, flat or loosely convolute, glabrous or sparsely pilose, smooth or scabrous, veins (11)15-39, ribs obscure;

abaxial sclerenchyma in narrow strands;

adaxial sclerenchyma developed;

girders or pillars usually associated with 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.

13-25 cm, open, with 1-2(3) branches per node;

branches lax, usually reflexed, sometimes spreading, spikelets borne towards the ends of the branches, not or only slightly imbricate.

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

4-5(7) mm, elliptic to ovate, with 2-4(6) 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.

ovate-lanceolate, scabrous on the veins and distal margins;

lower glumes 2.5-3.5 mm, usually distinctly shorter than the adjacent lemmas;

upper glumes 3-4(4.7) mm;

lemmas 3-4.5 mm, ovate-lanceolate to ovate, stiffly chartaceous, glabrous, obtuse or somewhat acute, unawned;

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

anthers (0.8)1-1.7(2.2) mm;

ovary apices pubescent.

= unknown.

= 42.