Flora of North America species comparison

1-1.6 m, erect.

5-35 cm tall, 1-3 mm thick.

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;

ligules 1.5-3.5 mm;

blades 2-35(50) cm long, 1.5-3 mm wide, often floating, sometimes scabridulous on the midribs and margins, apices acute.

21-33 cm, with 7-10 spikelets;

internodes 1.8-8 cm;

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

2.8-10 cm, with 5-8 spikelets;

internodes 4-30 mm;

pedicels 1.5-3 mm long.

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

10-19 mm, with 5-12 florets, lower florets bisexual, upper florets pistillate.

3.5-4 mm.

2.5-3 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.

glumes 1-2.5 mm;

upper glumes 2-3.5 mm;

rachilla internodes 1-1.5(2) mm long, 0.1-0.2 mm thick, without glandular swellings;

lemmas 3.5-5 mm, 7(9)-veined, densely scabridulous, apices truncate to rounded, entire, emarginate, unawned or awned, awns 0.2-1 mm;

paleal keels scabridulous, winged, each with 2 awns, awns flattened, purple, scabridulous, lower awn 1-3 mm, upper awn 0.3-1 mm;

anthers about 2 mm, occasionally to 2.6 mm.

=16, 36.

= 40, 42.