Flora of North America species comparison

(10)50-140 cm, stout, stiffly erect, branched from the middle and lower nodes;

lower nodes sericeous;

lower internodes sericeous, hairs papillose-based, upper internodes sometimes glabrous.

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

lower nodes pubescent;

upper nodes glabrous.

rounded, glabrous or sparsely to densely hispid, hairs not fragile and prickly, not causing skin irritation, margins ciliate;

ligules 1-3 mm;

blades 3-60 cm long, 2-12 mm wide, flat or involute, ascending, adaxial surfaces densely hirsute basally, less densely so elsewhere, bases attenuate, apices acute.

(4)15-40 cm long, (3)10-25 cm wide, about 1/3 – 1/2 as long as the plants, open, breaking at the base of the peduncles at maturity and dispersed as tumbleweeds, secondary branching mostly confined to the distal 1/3 of the primary branches;

rachises densely hispid or glabrous;

lower primary branches in whorls of 4-7, stiffly spreading, naked on the lower 1/2;

pedicels 3-20 mm, appressed.

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.

2-3 mm long, 0.8-1.2 mm wide, glabrous.

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

1-1.6 mm, 5-veined, acuminate;

upper glumes and lower lemmas similar, 2-2.8 mm, 7-9-veined, exceeding the upper florets by about 0.3 mm;

lower florets sterile;

lower paleas 1.4-2.2 mm;

upper florets 1.5-1.9 mm long, 0.7-1 mm wide, smooth, chestnut brown at maturity.

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.

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.

= 36.

= 20, 36, 40.