Flora of North America species comparison

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.

50-100 cm tall, 0.8-1.5 mm thick, glabrous;

nodes 2-3.

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.

20-55 cm long, 3-8 cm wide, open, often enclosed to midlength at anthesis;

lower branches 5-8 cm, ascending to divergent, flexuous.

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.

5-12 mm long, 0.5-0.7 mm wide, 3-5-veined;

upper glumes 1-4 mm shorter, 3-veined;

florets 4-7.5 mm long, 0.5-0.9 mm thick, fusiform, terete;

calluses 1-2 mm, sharp;

lemmas evenly hairy, hairs 0.4-0.8 mm throughout, apical lobes not present;

awns 35-70 mm, persistent, twice-geniculate, first 2 segments scabrous, terminal segment flexuous;

paleas 1-2 mm, 1/3 – 1/2 as long as the lemmas, sparsely to moderately pubescent, apices rounded, flat;

anthers 3-3.5 mm, dehiscent, a few penicillate, hairs about 0.3 mm.

5-7 mm, fusiform.

about 4 mm, fusiform.

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.

sheaths mostly glabrous, ciliate on the margins;

collars glabrous on the back, usually with tufts of hair on the sides, hairs about 0.8 mm;

basal ligules 0.8-1.6 mm, membranous, glabrous, rounded to acute;

upper ligules to 4.5 mm, acute;

blades 0.7-3.5 mm wide, abaxial surfaces smooth to scabridulous, adaxial surfaces prominently ribbed, scabridulous or sparsely to densely pubescent, hairs about 0.1 mm.

=34.

= 44, 46.