Flora of North America species comparison

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

50-120 cm, stout.

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.

closed for 1/2 - 3/4 their length, distinctly compressed, keels winged, bases of basal sheaths glabrous;

ligules 1-2 mm, smooth or sparsely scabrous, apices truncate;

blades (4)6-15 mm wide, flat or folded, apices broadly and abruptly prow-shaped.

mainly pseudointravaginal.

extravaginal.

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.

10-20 cm, ovoid to pyramidal, open, spikelets numerous, with 3-5 branches per node;

branches ascending to spreading, angled, angles densely scabrous.

3-5.6 mm, laterally compressed;

florets 2-5;

rachilla internodes glabrous, usually shorter than 1 mm.

4-9 mm, laterally compressed;

florets 3-5;

rachilla internodes about 1 mm, scabrous, glabrous.

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.

distinctly keeled, keels scabrous;

lower glumes 1-3-veined;

calluses glabrous;

lemmas 3.5-4.5 mm, narrowly lanceolate, distinctly keeled, scabrous, glabrous throughout, lateral veins prominent, apices acute;

palea keels scabrous, glabrous;

anthers 1.5-3 mm.

= 14.