Flora of North America species comparison

10-100 cm, 2-10 mm thick, erect, simple or sparingly branched basally;

nodes sericeous, pilose or glabrous;

internodes usually glaucous.

often crowded basally;

sheaths rounded, glabrous or hirsute, hairs fragile, papillose-based, margins sometimes ciliate distally;

ligules 0.6-2 mm;

blades 4-23 cm long, 1-10 mm wide, erect to spreading, flat or sometimes involute (on sterile branches), often curling at maturity, glaucous, abaxial surfaces sometimes with prominent papillae along the midribs, bases rounded or narrowing to the sheaths, margins cartilaginous, ciliate basally, scabridulous elsewhere, apices acute.

relatively lax, ascending to spreading, not strongly clustered basally or curling at maturity.

scarcely exceeding the blades, with more closely spaced spikelets than in subsp. hallii;

main branches rarely whorled, more crowded.

2.1-4.2 mm long, 0.8-1 mm wide, usually ovoid, glabrous.

2.1-3 mm.

1.2-2.4 mm, 1/2 - 3/4 as long as the spikelets, attenuate;

upper glumes and lower lemmas similar, 7-11-veined, acuminate, extending 0.3-1.2 mm beyond the upper florets;

lower florets sterile;

lower paleas 0.8-2 mm;

upper florets 1.5-2.4 mm long, 0.7-1.2 mm wide, ovoid to ellipsoid, smooth, nigrescent.

panicles 7-31 cm long, 3-15 cm wide;

rachises glabrous, tending to break at maturity;

branches usually alternate, slender, stiff, ascending to divergent;

pedicels 1-15 mm, appressed.

= 18.