Flora of North America species comparison

30-120 cm, bases often decumbent.

20-80 cm.

closed for (1/20) 1/2-7/8 their length, terete, throats frequently ciliate near the point of fusion;

ligules 0.5-2.7 mm, smooth or sparsely scabrous, truncate to obtuse;

blades 0.7-5 mm wide, flat, thin, lax.

closed for at least 9/10 their length;

ligules 0.5-2 mm, smooth, truncate;

blades 1.5-5 mm wide, flat, lax.

mainly pseudointravaginal.

mainly pseudointravaginal.

(6.7)9-20 cm, open, narrowly conical at maturity;

nodes with (2)3-10 branches per node;

branches (2)3-7 cm, spreading to eventually reflexed, straight, angled, angles several, densely scabrous, with 1-11 spikelets.

6-22 cm, lax, narrowly lanceoloid, sparse;

nodes with 1-3 branches;

branches ascending, lax, angled, angles scabrous.

2.5-4.4 mm, laterally compressed;

florets 2-3(4);

rachilla internodes longer than (1)1.2 mm, smooth, glabrous.

3.5-7 mm laterally compressed;

florets (1)2(4);

rachilla internodes about 1 mm, smooth, glabrous.

distinctly keeled, keels scabrous;

lower glumes 1(3)-veined;

upper glumes shorter than or subequal to the lowest lemmas;

calluses webbed;

lemmas 2.1-3.1 mm, broadly lanceolate, distinctly keeled, keels and marginal veins short-villous, extending to near the apices on the keels, lateral veins prominent, softly puberulent to short-villous, intercostal regions usually sparsely softly puberulent, smooth, apices obtuse to acute;

palea keels softly puberulent at midlength, apices finely scabrous;

anthers 1-1.8 mm.

distinctly keeled, keels scabrous;

lower glumes 1-veined;

upper glumes shorter than or subequal to the lowest lemmas;

calluses webbed, webs sparse;

lemmas 3.2-5 mm, narrowly lanceolate, distinctly keeled, glabrous, acuminate;

palea keels scabrous, sometimes sparsely so;

anthers 0.5-1.2 mm.

= 28.

= unknown.