Flora of North America species comparison

25-90 cm.

20-80 cm, erect or the bases decumbent.

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.

usually closed for about 1/6 their length;

ligules 1-4 mm, smooth or sparsely scabrous, apices obtuse to acute;

innovation blades 0.5-2 mm wide;

cauline blades 0.5-5 mm wide, flat, folded, abaxial surfaces smooth or scabrous, apices narrowly prow-shaped.

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.

5-15 cm, erect, usually contracted, sometimes interrupted;

branches shorter than 4 cm, erect, angles somewhat scabrous.

4-6.5 mm, laterally compressed;

florets 2-5;

rachilla internodes to 1 mm, smooth, glabrous.

4-7 mm, weakly laterally compressed;

florets 2-5;

rachilla internodes smooth.

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.

3-veined;

calluses glabrous or webbed, hairs to 1/4 the lemma length;

lemmas 2.5-4.5 mm, narrowly lanceolate, distinctly to weakly keeled, glabrous throughout or the keels and marginal veins sparsely long-villous, apices acute;

palea keels scabrous;

anthers aborted late in development or 1.3-2.2 mm.

= 28.

= 64.