Flora of North America species comparison

10-60 cm.

31-126 cm.

closed for 1/3 – 2/3 their length, terete, smooth;

ligules 1.5-3.5 mm, smooth or sparsely scabrous;

blades 1.5-4 mm wide, flat, thin, soft, apices broadly prow-shaped.

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.

mixed intra- and extravaginal.

mainly pseudointravaginal.

4-15 cm, nodding, open, with numerous spikelets and 1-2 branches per node;

branches (2)3-7 cm, spreading to reflexed, lower branches usually reflexed, flexuous, usually terete, smooth or sparsely scabrous, with (3)6-18 spikelets.

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 mm, lanceolate to broadly lanceolate, usually partly to wholly purplish, with 3-5 florets;

rachilla internodes shorter than 1 mm, smooth.

3.5-6.7 mm, laterally compressed;

florets 2-4;

rachilla internodes glabrous.

narrowly to broadly lanceolate, distinctly keeled, keels smooth or nearly so;

lower glumes 1-veined;

upper glumes shorter than or subequal to the lowest lemmas;

calluses webbed;

lemmas 2-3.5 mm, lanceolate, partly purple to fairly strongly purple, distinctly keeled, keels and marginal veins short- to long-villous, keels hairy for 2h-ls their length, lateral veins usually sparsely softly puberulent at least on 1 side, lateral veins obscure to moderately prominent, intercostal regions smooth, minutely bumpy, glabrous, apices acute, slightly bronze-colored or not;

palea keels scabrous, usually softly puberulent at midlength;

anthers 0.6-1 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.