Flora of North America species comparison

20-90 cm, erect or decumbent, puberulent below the panicle.

90-150 cm, erect;

nodes 2-4, pubescent or puberulent;

internodes glabrous to pubescent, pilose to densely pubescent below the nodes.

softly pilose, hairs often retrorse or spreading;

auricles absent;

ligules 2-3 mm, glabrous, obtuse, lacerate or erose;

blades 3.5-27 cm long, 1-9 mm wide, both surfaces pilose.

13-25 cm long, 2-12 cm wide, erect to spreading;

branches 1-7 cm, stiffly erect to ascending or spreading, with 1 or 2 spikelets.

7-13.5 cm, open;

branches erect, ascending and appressed to slightly spreading.

25-70 mm, sides parallel or diverging distally, moderately laterally compressed, with 4-11 florets.

20-40 mm, elliptic to lanceolate, terete to moderately laterally compressed, with 3-9(11) florets.

smooth or scabrous, margins hyaline;

lower glumes 15-25 mm, 1-3-veined;

upper glumes 20-35 mm, 3-5-veined;

lemmas 20-35 mm, linear-lanceolate, scabrous, 7-veined, rounded over the midvein, margins hyaline, apices bifid, acuminate, teeth 3-5 mm;

awns 30-65 mm, straight, arising 1.5 mm or more below the lemma apices;

anthers 0.5-1 mm.

usually glabrous, occasionally scabrous or pubescent;

lower glumes 5-9 mm, 1(3)-veined;

upper glumes 7-11 mm, 3(5)-veined, sometimes mucronate;

lemmas 9-16 mm, elliptic, rounded over the midvein, backs usually pubescent, sometimes glabrous or scabrous, margins pubescent or scabrous, apices obtuse, entire;

awns (4)5.5-8 mm, straight, arising less than 1.5 mm below the lemma apices;

anthers 3-5 mm.

sheaths sparingly to densely pilose, hairs 2-4 mm, occasionally glabrous;

upper sheaths hairy, hairs to 1 mm, collars glabrous or pilose, hairs to 4 mm;

auricles absent;

ligules 1-3 mm, usually glabrous, occasionally pilose, obtuse, erose;

blades 7-24 cm long, 3-12 mm wide, flat, usually glabrous, sometimes hairy.

= 42, 56.

= 14.