Flora of North America species comparison

10-60 cm.

20-80 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 at least 9/10 their length;

ligules 0.5-2 mm, smooth, truncate;

blades 1.5-5 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.

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

nodes with 1-3 branches;

branches ascending, lax, angled, angles scabrous.

4-6 mm, lanceolate to broadly lanceolate, usually partly to wholly purplish, with 3-5 florets;

rachilla internodes shorter than 1 mm, smooth.

3.5-7 mm laterally compressed;

florets (1)2(4);

rachilla internodes about 1 mm, smooth, 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.

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.