Flora of North America species comparison

25-90 cm.

31-126 cm.

closed for 1/2 - 3/4 their length, smooth or sparsely scabrous, margins not ciliate;

ligules 0.3-2.1 mm, smooth or sparsely scabrous, truncate to obtuse, ciliolate;

blades 0.6-3.5 mm wide, flat.

closed for 1/2 - 7/8 their length;

ligules 0.1-1.7(2.1) mm, smooth or sparsely scabrous, truncate to obtuse;

blades 0.8-4.1 mm wide, flat, lax.

mainly pseudointravaginal.

mainly pseudointravaginal.

7.5-15(18) cm, lax, pyramidal, open, sparse;

nodes with 1-3(5) branches;

branches 3-8 cm, ascending, straight to spreading, angled, angles prominent, scabrous.

11.4-36 cm, erect or lax, narrowly pyramidal, usually open, infrequently contracted;

nodes with (2)3-5(7) branches;

branches spreading, straight, angled, angles sparsely to moderately scabrous.

4-6.5 mm, laterally compressed;

florets 2-5;

rachilla internodes to 1 mm, smooth, glabrous.

3.5-6.7 mm, laterally compressed;

florets 2-4;

rachilla internodes glabrous.

1/2-1/3 the length of the adjacent lemmas, distinctly keeled, keels scabrous;

lower glumes subulate to narrowly lanceolate, (1)3-veined;

upper glumes shorter than or subequal to the lowest lemmas;

calluses webbed;

lemmas (2.5)3.2-4.7 mm, lanceolate, green, distinctly keeled, keels and marginal veins long-villous, hairs extending up almost the whole keel length, lateral veins prominent, intercostal regions smooth, minutely bumpy, usually glabrous, rarely sparsely softly puberulent, apices acute, blunt, or pointed, white, not bronze;

palea keels softly puberulent at midlength, apices scabrous;

anthers (0.5)0.8-1.2(1.5) mm.

ovate, distinctly keeled, keels scabrous;

lower glumes 1-veined;

upper glumes shorter than or subequal to the lowest lemmas;

calluses webbed;

lemmas 2.7-4.2(5) mm, lanceolate, distinctly keeled, keels short-villous to about midlength, marginal and lateral veins glabrous, lateral veins obscure or moderately prominent, intercostal regions glabrous, smooth, apices acute;

paleas glabrous or ciliolate over the keels, apices finely scabrous;

anthers 0.4-0.8 mm.

= 28.

= unknown.