Flora of North America species comparison

10-75 cm, erect.

30-110 cm, erect or geniculate at the base.

closed for less than 1/3 their length, smooth to scabridulous;

ligules 3-7 mm, acute, usually lacerate;

blades usually 4-20 cm long, 1-4.5 mm wide, smooth to scabridulous, margins cartilaginous and whitish.

sheaths closed to near the top;

ligules 0.5-1 mm, truncate;

blades 10-40 cm long, 2-6(8.5) mm wide, usually with hairs to 2 mm.

sheaths closed for nearly their entire length, pubescent;

ligules 5-8 mm, acute;

blades 10-40 cm long, 2-6 mm wide, usually pubescent, margins very narrowly cartilaginous.

(4)6-11(13) cm long, usually 0.8-2.5 cm wide, erect or ascending;

branches 10-25 mm, usually straight, stiff, usually with 1-2 spikelets.

6-20 cm long, 2-6 cm wide, erect or nodding;

branches 4-35 mm, flexuous or straight, with 1-4 spikelets.

12-16 mm, with 3-6 florets;

rachilla internodes usually 1.5-2.5 mm, hairs 0.2-1.5 mm.

10-26 mm, with 2-4 florets;

rachilla internodes about 2.5 mm, hairs 3-7 mm.

thin, acute;

lower glumes 9-13 mm, 3-veined;

upper glumes 9-14 mm, 3-5-veined;

calluses bearded, hairs usually shorter than 1 mm;

lemmas 10-12 mm, awned, awns 10-17 mm, flattened below the bend;

paleas 6-8.75 mm;

anthers 2.5-5 mm.

scabrous on the veins.

7-20 mm, 1(3)-veined;

upper glumes 10-26 mm, 3-veined;

calluses bearded, hairs 2-5 mm;

lemmas 8-16 mm, awned, awns 12-26 mm, terete below the bend;

paleas 8-12 mm;

anthers 5-7 mm.

= 14.

= 14, 28.