Flora of North America species comparison

1-1.6 m, erect.

40-95 cm tall, 2-3.5 mm thick, 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, smooth or scabridulous;

ligules 5-10 mm, rounded or acute, often erose;

blades 5-17 cm long, 4-9 mm wide, smooth or scabridulous over the veins, apices spinose.

21-33 cm, with 7-10 spikelets;

internodes 1.8-8 cm;

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

13-20 cm, with 6-7 spikelets;

lower internodes 3.5-7.2 cm;

upper internodes shorter;

pedicels 2-5(12) mm.

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

20-40(50) mm, with 7-14 florets, lower florets bisexual, upper florets pistillate, terminal florets usually sterile.

lanceolate to ovate, acute, erose;

lower glumes 2-3 mm;

upper glumes 2.5-4.5 mm;

rachilla internodes 2-3 mm long, 0.1-0.2 mm thick, without a glandular swelling at the base;

lemmas 5.5-7 mm, scabridulous, 7-veined, veins prominent, apices truncate, sometimes erose, awned, awns 5-12 mm;

paleal keels awned, awns 3-9 mm, inserted 1/3 – 1/2 of the way from the base;

anthers about 4 mm.

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.

=16, 36.

= unknown.