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.

20-80 cm, often in small clumps, compressed, erect or decumbent, glaucous;

lower nodes pubescent;

upper nodes glabrous.

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.

5-15 cm long, 0.8-1.5 cm wide;

branches 2-6, spikelike, erect, puberulent, 3-angled; ultimate branchlets 1-sided;

pedicels paired, congested, shorter pedicels 0.1-1 mm, longer pedicels 1.5-2.5 mm.

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

2.8-4.4 mm, ellipsoid, terete to slightly laterally compressed, glabrous, obtuse.

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.

about 3/4 as long as the spikelets, 5- or 7-veined;

upper glumes and lower lemmas equaling the spikelets, 5-9-veined;

lower florets staminate;

lower paleas 2.5-3.5 mm;

upper florets puberulent at the bases and apices.

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.

sheaths ascending, pubescent to pilose;

upper sheaths glabrous;

ligules 0.2-2 mm, membranous, truncate, irregularly denticulate;

blades 3-26 cm long, 2-7 mm wide, ascending, firm, glaucous, sparsely pilose near the base, often scabrous on the margins, involute towards the apices.

= 18.

= 20, 36, 40.