Flora of North America species comparison

30-90 cm tall, 0.5-2 mm thick, erect, much branched above the base;

internodes dull, puberulent or glabrous for most of their length, sometimes strigose immediately below the nodes.

18-50 cm, erect, rounded near the base;

internodes glabrous.

smooth or scabridulous, somewhat keeled;

ligules 0.4-1 mm, membranous, truncate, lacerate-ciliolate;

blades 2-20 cm long, 2-6 mm wide, flat, scabrous or smooth, those of the secondary branches similar in length and width to those of the main branches.

glabrous, bases becoming flattened and papery, lower sheaths longer than the internodes;

ligules 2-5 mm, membranous, acute to acuminate;

blades (5)6-12 cm long, 1-2.5 mm wide, flat, becoming loosely involute to subfiliform, scabrous abaxially, hirsute adaxially, apices not sharp.

terminal and axillary, 2-21 cm long, 0.3-3 cm wide, dense;

primary branches 0.3-5.5 cm, appressed or diverging up to 30° from rachises;

pedicels to 2 mm, strigose;

axillary panicles exserted on long peduncles.

4-15 cm long, 1.5-4 cm wide, not dense;

primary branches 0.5-5 cm, appressed or diverging up to 40° from the rachises;

pedicels 0.5-6 mm, flattened, scabrous.

1.5-3.8 mm, often purple-tinged.

2.8-3.5 mm.

subequal, 1.5-3.7 mm, equaling or slightly shorter than the lemmas, 1-veined, tapering from the bases to the acuminate apices, unawned or awned, awns to 2 mm;

lemmas 1.5-3.8 mm, lanceolate, pubescent on the calluses, lower portion of the mid-veins, and margins, hairs shorter than 0.7 mm, apices scabridulous, acuminate, unawned or awned, awns to 10 mm;

paleas 1.5-3.8 mm, narrowly lanceolate, apices acuminate;

anthers 0.3-0.5 mm, yellow to purplish.

subequal, 0.6-1.8 mm, scabridulous distally, truncate to obtuse, unawned;

lower glumes 1-veined;

upper glumes 3-veined, 3-toothed, often erose;

lemmas 2.8-3.5 mm, lanceolate, loosely pubescent on the basal 1/3 of the midveins and margins, hairs to 0.6 mm, apices scabridulous, acute, mucronate, mucros shorter than 1 mm;

paleas 2.8-3.5 mm, lanceolate, acute;

anthers 1.4-2.3 mm, purple.

1.1-1.6 mm, fusiform, brown.

1.6-1.8 mm, fusiform, light brown.

= 40.

= 20.