Flora of North America species comparison

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

50-120 cm.

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, usually sparsely to moderately retrorsely scabrous, margins not ciliate;

ligules 2-3.5 mm, smooth or sparsely scabrous, obtuse to acute;

blades 3-8 mm wide, flat, lax, apices narrowly 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.

14-30 cm, open, sparse, with 1-3(4) branches per node;

branches (5.5)8-12(15) cm, widely spreading, fairly straight, angled, angles sparsely to moderately scabrous, with 3-13 spikelets.

3-5.6 mm, laterally compressed;

florets 2-5;

rachilla internodes glabrous, usually shorter than 1 mm.

4-8 mm, laterally compressed, rarely bulbiferous;

florets 2-4, usually normal, rarely bulb-forming;

rachilla internodes about 1 mm, smooth, 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 lanceolate, 1-3-veined;

upper glumes shorter than or subequal to the lowest lemmas;

calluses webbed;

lemmas 3.2-6 mm, lanceolate, distinctly keeled, smooth or sparsely finely scabrous, keels and marginal veins long-villous, keels hairy to 2/3 – 3/4 their length, marginal veins sparsely hairy, lateral veins moderately prominent, usually glabrous, rarely sparsely softly puberulent, intercostal regions glabrous, apices acute;

paleas scabrous, glabrous over the keels;

anthers 0.5-1.1 mm.

= ca. 98.