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.

20-70 cm tall, less than 3 mm thick, erect, branched above;

internodes smooth, shiny for most of their length, scabridulous or glabrous 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.

glabrous, margins hyaline, old sheaths not flattened, papery, or spirally coiled;

ligules 0.2-1.1 mm, membranous, truncate, sometimes ciliolate;

blades 2-8.5 cm long, 2-5 mm wide, flat, smooth or scabridulous.

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.

4.2-16.5 cm long, 0.2-1.5 cm wide, mostly exserted from the sheath;

primary branches 0.8-7.2 cm, ascending to appressed;

pedicels 0.6-3 mm, strigose.

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

2.2-3.4 mm.

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.

shorter than the florets, veins scabridulous, unawned or awned, awns to 0.5 mm;

lower glumes 0.4-1.5 mm, veinless (rarely 1-veined), usually truncate to rounded, occasionally acute, sometimes notched;

upper glumes 0.8-1.9 mm, 1(2)-veined, acute to acuminate;

lemmas 2.2-3(3.4) mm, lanceolate, hairy on the calluses and lower portion of the margins and midveins, hairs shorter than 1.5 mm, apices scabridulous, acuminate, awned, awns 0.5-4 mm, straight;

paleas 2.2-3.1(3.4) mm, lanceolate, intercostal region shortly pilose on the lower 1/2, apices acuminate;

anthers usually not developed, occasionally 1 or 2 present, 0.3-0.9 mm, yellow.

2-2.3 mm, fusiform, brown.

1.4-1.6 mm, fusiform, brown.

= 40.

= unknown.