Flora of North America species comparison

20-95 cm tall, 0.8-1.5 mm thick.

20-80 cm, erect or the bases decumbent.

closed for 1/3-2/3 their length;

ligules 0.2-3(4) mm, smooth or sparsely scabrous, truncate to obtuse;

blades 1-3.6 (6) mm wide, flat, thin, lax, veins prominent.

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.

4-20(24) cm long, less than 1/4 the plant height, lax;

nodes with 1-3 branches;

branches ascending to spreading, lax, angled, angles prominent, scabrous.

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

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

3-5.6 mm, laterally compressed;

florets 2-5;

rachilla internodes glabrous, usually shorter than 1 mm.

4-7 mm, weakly laterally compressed;

florets 2-5;

rachilla internodes smooth.

2/3 – 3/4 as long as the adjacent lemmas, distinctly keeled;

lower glumes 1(3)-veined;

upper glumes shorter than or subequal to the lowest lemmas;

calluses webbed;

lemmas 2.4-4 mm, lanceolate to broadly lanceolate, distinctly keeled, usually glabrous, bases of marginal veins rarely sparsely softly puberulent, lateral veins prominent, intercostal regions smooth, minutely bumpy, apices obtuse to sharply acute or acuminate;

palea keels scabrous;

anthers 0.4-1.5 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.

= 64.