Flora of North America species comparison

100-230 cm tall, 2-4.5 mm thick, mostly glabrous, often pubescent below the nodes, the pubescence antrorse or retrorse;

nodes 4-5.

30-75 cm tall, 0.5-1.7 mm thick, internodes pubescent or glabrous, pubescence more common on the lower internodes, particularly just below the nodes;

nodes 2-3, lower nodes retrorsely pubescent, upper nodes glabrous or pubescent.

15-30 cm long, 0.8-3.5 cm wide;

branches straight, appressed to ascending, lower branches 3-9 cm.

7-15 cm long, 0.5-2.5 cm wide, often included in the upper leaf sheaths at the start of anthesis;

branches 1.5-6 cm, appressed to strongly ascending, with 1-6 spikelets.

appressed to the branches.

subequal, 9-11.5 mm long, 1-1.4 mm wide;

florets 5.9-8.5 mm long, 0.9-1.2 mm thick, fusiform, terete;

calluses 0.3-1 mm, blunt;

lemmas evenly hairy, hairs at midlength 0.3-0.8 mm, apical hairs to 1.5 mm;

awns 20-32 mm, persistent, twice-geniculate, scabridulous to scabrous, scabrules to about 0.1 mm, longest on the middle segment, terminal segment straight;

paleas 3.7-5.6 mm, 2/3 - 3/4 as long as the lemmas, hairy, hairs about 0.5 mm, not exceeding the apices, veins terminating below the apices, apices rounded;

anthers 4-5 mm, dehiscent, penicillate.

often purplish;

lower glumes 10-15 mm long, 1.2-2 mm wide;

upper glumes to 2 mm shorter;

florets 6-9 mm long, 0.7-1.2 mm thick, fusiform, terete;

calluses 0.9-1.5 mm, sharp;

lemmas coriaceous, evenly pubescent or the back glabrate distally, hairs 0.5-0.8 mm, apices lobed on 1 margin, lobe about 0.1 mm long, thick, apical lemma hairs 0.5-0.8 mm;

awns 32-56 mm, twice-geniculate, first 2 segments pilose, hairs 0.8-2 mm, terminal segment glabrous, often scabrous;

paleas 4.6-6.1 mm, 3/4 - 9/10 as long as the lemmas, sparsely pubescent towards the base;

anthers 2.5-3.5 mm, dehiscent, not penicillate.

5-6 mm.

5-7 mm, fusiform.

sheaths mostly glabrous, margins usually ciliate distaily;

collars hairy, those of the flag leaves densely hairy, hairs 0.5-2 mm, sides glabrous;

basal ligules 1-2 mm;

upper ligules to 4 mm, truncate, rounded, or obtuse, glabrous;

blades 6-10 mm wide, glabrous, abaxial surfaces smooth, adaxial surfaces prominently ribbed, ribs scabrous.

sheaths glabrous, usually smooth, brown or gray-brown;

collars glabrous, without tufts of hair at the sides;

basal ligules 1.5-6 mm, hyaline, rounded to acute, lacerate;

upper ligules to 8 mm, hyaline, acute, glabrous;

blades 0.5-2 mm wide, convolute, abaxial surfaces scabrous, adaxial surfaces scabrous or hairy, hairs about 0.3 mm.

= 64.

=34.