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.

14-80 cm tall, 0.8-2 mm thick, internodes glabrous or pubescent below the nodes;

nodes 3-5, glabrous.

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.

7-15 cm long, 1.5-4 cm wide;

branches strongly ascending at maturity, longest branches 1.5-4 cm.

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.

unequal to subequal, narrowly lanceolate, 3-5-veined;

lower glumes 9-15 mm long, 0.9-1.2 mm wide;

upper glumes 8-15 mm;

florets 4.8-6.5 mm long, 0.8-1 mm thick, fusiform, terete;

calluses 0.2-0.8 mm, acute;

lemmas evenly and densely hairy, hairs 1.5-3.5 mm at midlength, apical hairs 2.5-5 mm;

awns 10-35 mm, persistent, once-geniculate, first segment scabrous or strigose, hairs to 0.3 mm, terminal segment straight;

paleas 2.5-4.5 mm, 1/2 - 4/5 times the length of the lemmas, hairy between the veins, hairs often as long as those on the lemmas but not as dense, apices usually rounded, occasionally somewhat pinched;

anthers 2.3-4.5 mm, dehiscent, not penicillate.

5-7 mm, fusiform.

3-6 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, sometimes pubescent at the base, flat and ribbonlike with age, margins sometimes hairy distally, hairs adjacent to the ligules 0.5-3 mm;

collars glabrous;

ligules truncate, abaxial surfaces pubescent, ciliate, cilia as long as or longer than the basal membrane, ligules of basal leaves 0.3-0.8 mm, of upper leaves 0.5-1.5 mm, asymmetric;

blades 4-30+ cm long, 1-4.2 mm wide, usually flat and more or less straight, sometimes tightly convolute and arcuate.

=34.

= unknown.