Flora of North America species comparison

30-120 cm tall, 0.8-2.5 mm thick, erect, seldom branched above the base;

internodes dull, mostly puberulent (sometimes sparsely so), terete, rarely keeled, strigose immediately below the nodes.

5-30(40) cm, erect, rounded near the base;

internodes smooth or scabridulous.

scabridulous, slightly keeled;

ligules 0.2-0.6 mm, membranous, truncate, lacerate-ciliolate;

blades 2-15 cm long, 2-6 mm wide, flat, usually scabrous or scabridulous, occasionally smooth.

longer than the lower internodes, glabrous, becoming flattened and papery or ribbonlike at maturity;

ligules 2-4(5) mm, membranous, acute;

blades 2-6 cm long, 0.4-1.6 mm wide, tightly involute, filiform, stiff, scabrous abaxially, sparsely hirtellous adaxially, apices sharp.

1.5-12 cm long, 0.3-1.8 cm wide, lobed, dense;

primary branches 0.2-2.5 cm, appressed;

pedicels absent or to 1 mm, strigose.

1.5-7 cm long, 0.4-2 cm wide, contracted, sometimes dense;

primary branches 0.1-2.8 cm, mostly tightly appressed or diverging up to 30° from the rachises;

pedicels 0.1-2 mm, scabrous.

3-8 mm.

2.2-3.5 mm.

subequal, 3-8 mm (including the awn), about 1.3-2 times longer than the lemmas, smooth or scabridulous distally, 1-veined, acuminate, awned, awns to 5 mm;

lemmas 1.9-3.1 mm, lanceolate, pubescent on the calluses, mid-veins, and margins, hairs to 1.2 mm, apices scabridulous, acuminate, unawned or awned, awns to 1 mm;

paleas 1.9-3.1 mm, lanceolate, loosely pilose between the veins, apices acuminate;

anthers 0.8-1.5 mm, yellowish.

subequal, 0.8-2.5 mm, scabridulous distally;

lower glumes 1-veined, awned, awns to 1.6 mm;

upper glumes usually 3-veined, apices truncate to acute, 3-toothed, teeth sometimes shortly awned, awns to 0.6 mm;

lemmas 2.2-3.5 mm, lanceolate, yellowish mottled with dark green, sparsely appressed-pubescent on the lower portion of the midveins and margins, hairs to 0.4 mm, apices scabridulous, acute to acuminate, awned, awns 1-5 mm, straight or flexuous;

paleas 2.2-3.5 mm, lanceolate, acute to acuminate;

anthers 1.5-2 mm, purplish.

1-1.6 mm, fusiform, brown.

1.3-1.6 mm, fusiform, brownish.

= 20.

= unknown.