Flora of North America species comparison

30-80 cm, erect or geniculate at the base, usually with 2 nodes.

30-80 cm, smooth, glabrous, sometimes decumbent at the base and rooting at the lower nodes.

mostly basal, sometimes forming a basal tuft;

sheaths smooth, glabrous;

ligules 1.5-3.6 mm, rounded to acute;

blades 12-25 cm long, strongly rolled, 0.3-0.5 mm in diameter, abaxial surfaces smooth or scabridulous, glabrous or hairy, often scabridulous or hairy proximally and essentially smooth and glabrous distally, adaxial surfaces scabrous, flag leaf blades 5-8 cm.

not forming a tuft;

sheaths smooth;

ligules 4-7.5 mm, acute;

blades 1-3 mm wide, convolute to involute, abaxial surfaces smooth, adaxial surfaces scabrous.

5-15 cm long, (2)4-12 cm wide, narrow to open, often nodding;

branches ascending to spreading, flexuous, smooth or scabridulous.

10-20 cm long, 8-14 cm wide;

branches ascending to laxly diverging or reflexed, somewhat scabrous, longest branches at the lower nodes usually undivided for 1/3-1/2 their length.

4-7 mm, ovate or U-shaped.

6-7.5 mm, bisexual.

exceeded by or subequal to the adjacent florets, 1-veined, acute;

lower glumes 2.7-4.5 mm;

upper glumes 3.5-5 mm;

callus hairs to 1 mm;

lemmas 3.3-5 mm, scabridulous or puberulent, hairs to 0.1 mm, apices acute, erose to 4-toothed, awns 3.7-7 mm, attached near the base of the lemma, strongly geniculate, geniculation below the lemma apices, distal segment 2.5-4.5 mm, pale;

anthers 2-3 mm.

acuminate, equaling or slightly longer than the distal floret;

callus hairs 1.5-2 mm;

lemmas 4.5-5.5 mm, awns attached on the lower 1/4 - 2/3, inconspicuous, weakly geniculate, from shorter than to exceeding the lemma by approximately 2 mm;

anthers 1.5-2.7 mm.

= 14, 26, 28, 32, 42.

= 52.