Flora of North America species comparison

30-100 cm;

lower nodes sometimes sparsely bearded.

60-180 cm.

glabrous, not or obscurely keeled;

ligules to 0.5 mm, membranous, ciliate;

blades 1-4 mm wide, folded or involute, glabrous, apices sharp.

keeled, mostly glabrous, collars pubescent;

ligules to 0.5 mm, membranous, ciliate;

blades 3-10 mm wide, glabrous or sparsely hispid, apices attenuate and involute.

8-25 cm long, 0.5-1.3 cm wide, dense;

branches appressed, lowest branches 2-6 cm;

pedicels 1-2 mm.

15-40 cm long, 3-5 cm wide, erect or nodding;

branches 10-15(25) cm, strongly divergent to drooping, stiff or lax, lower branches naked for 1/3 – 1/2 of their length;

pedicels 3-8 mm.

4-10 mm, with 4-11 florets.

5-10 mm long, with 4-8 florets.

about as long as the adjacent lemmas, thin, 1-veined, acute or apiculate;

lower glumes 4-4.5 mm;

upper glumes 4-4.5 mm;

lemmas 3-4(5) mm, thin, papery, mostly white, often purple distally, glabrous or the lateral veins with a few short hairs towards the base, all veins ending before the distal margin;

paleas 3-3.5 mm, glabrous, bowed-out at the base;

anthers 1-1.5 mm.

2.5-3 mm, often mucronate;

upper glumes 3.5-4 mm;

lemmas 3-5 mm, lateral veins puberulent or ciliate to well above midlength, midveins and lateral veins usually excurrent, midveins extending to 0.5 mm, lateral vein extensions shorter;

paleas as long as the lemmas, widened below;

anthers 1-1.5 mm.

1.5-1.8 mm.

1.8-2 mm.

= 60, 64, 72.

= 40.