Flora of North America species comparison

1-1.6 m, erect.

(85)100-150 cm, erect.

glabrous, retrorsely scabridulous;

ligules 3-6.5 mm;

blades 3-30 cm long, 4-10 mm wide, apices acute to acuminate, mucronate, flag leaves often with reduced spinose blades.

glabrous or pubescent, sometimes scabridulous;

ligules 2-7 mm;

blades 10-40 cm long, 5-14 mm wide, apices acute or acuminate and sharply mucronate, flag leaves often reduced to spinose tips.

21-33 cm, with 7-10 spikelets;

internodes 1.8-8 cm;

pedicels 1.5-5 mm, erect or ascending, rarely reflexed.

(10)20-35 cm, with 6-14 spikelets;

internodes 2-5.6(8) cm;

pedicels 2-3 mm long, reflexed at maturity.

28-42 mm, erect or ascending, with 9-16 florets, usually all but the terminal floret bisexual.

(20)25-28 mm, pendent, with 7-14 florets, usually all but the terminal floret bisexual.

frequently scabrous, apices obtuse, sometimes erosely notched;

lower glumes 3-6 mm;

upper glumes 4-7(8.3) mm, 3-veined;

rachilla internodes 2-3 mm long, about 0.1 mm thick, bases sometimes weakly differentiated into a glandular swelling;

lemmas 8-10 mm, faintly 7(9)-veined, lateral veins occasionally prominent, apices truncate, sometimes toothed, awned, awns (5)9-20 mm;

paleal keels each with a 0.2-0.6(1) mm triangular appendage;

anthers 3.5-4 mm.

3.5-4 mm.

4.5-6 mm.

glumes 3-5.6 mm;

upper glumes 4.5-7.2 mm, 1-3-veined;

rachilla internodes 2-3 mm long, about 0.4 mm thick, basal 1/2 developing into a glandular swelling;

lemmas 8-9 mm, 7-veined, lateral veins strongly ribbed, apices toothed, usually rounded, rarely acute or erose, awned, awns 0.2-4 mm;

paleal keels unawned, each with a 0.6-1.5 mm triangular appendage;

anthers 4-4.8 mm.

=16, 36.

=32, 36.