Flora of North America species comparison

40-120 cm tall, less than 2 mm thick, erect;

internodes mostly pubescent, retrorsely hirsute to strigose below the nodes.

60-140 cm, erect;

internodes puberulent or glabrous for most of their length, puberulent below the nodes.

mostly glabrous, usually pubescent near the base, scabridulous distally;

ligules 0.4-1.2 mm, membranous, truncate, ciliolate;

blades 6-20 cm long, 4-10(15) mm wide, flat, glabrous and smooth abaxially, occasionally scabridulous adaxially.

shorter or longer than the internodes, smooth or scabridulous, tightly imbricate, yellowish-brown, basal sheaths laterally compressed, keeled, not becoming spirally coiled when old;

ligules 3-12 mm, firm and brown basally, membranous distally, acute;

blades 10-45 cm long, 1.6-5 mm wide, tightly folded, scabrous abaxially, hirsute adaxially.

usually terminal, 10-33 cm long, 0.2-0.8 cm wide, exserted;

branches 1-10 cm, ascending to appressed;

pedicels 1-6 mm, strigose.

18-40 cm long, 1.5-7 cm wide, loosely contracted to open, not dense;

branches 1-10 cm, ascending or diverging up to 60° from the rachises, stiff, naked basally;

pedicels 2-8 mm, hirtellous.

2.6-4.5 mm, overlapping the next spikelet on the branch by 1/4 of its length.

3-4.2 mm, yellowish to purplish.

subequal, 1.3-3 mm, shorter than the lemmas, 1-veined (lower glumes rarely 2- or 3-veined), tapering from near the base, bases overlapping, apices scabridulous, acute, unawned or awned, awns to 1 mm;

lemmas 2.6-4.5 mm, lanceolate to narrowly lanceolate, usually pubescent on the calluses, lower 1/3 of the midveins, and margins (hairs sometimes restricted to the callus), hairs shorter than 1.2 mm, apices acute or acuminate, usually awned, awns to 12 mm;

paleas 2.6-4.5 mm, lanceolate to narrowly lanceolate, shortly pilose on the lower portion, apices acuminate;

anthers 1.1-2.2 mm, yellowish.

subequal, 2-3 mm, exceeded by the florets, scabridulous or smooth, 1-veined, acute or obtuse, unawned;

lemmas 3-4.2 mm, lanceolate, glabrous or appressed-pubescent on the lower 1/4 of the margins, apices acute to obtuse, usually bifid and awned, teeth to 0.3 mm, awns 0.5-4 mm, straight;

paleas 3-4.2 mm, lanceolate, glabrous, acute to acuminate;

anthers 1-1.8 mm, purplish.

2-2.3 mm, fusiform, brown.

not seen.

= 40.

= 24.