Flora of North America species comparison

15-95 cm, erect or geniculate at the base, sometimes rooting at the lower nodes;

nodes 3-6.

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

glabrous;

ligules 2-6 mm;

blades 3-29 cm long, 3-8 mm wide, adaxial surfaces slightly scabridulous.

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.

8-35 cm, with 6-13 spikelets;

internodes 1-6 cm;

pedicels 1-5.5(9) mm, ascending to spreading.

2.8-10 cm, with 5-8 spikelets;

internodes 4-30 mm;

pedicels 1.5-3 mm long.

15-60 mm, ascending to spreading, with 7-20(30) florets, lower florets bisexual, upper florets pistillate, terminal florets sterile.

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

lanceolate to broadly ovate;

lower glumes 1-4.5 mm;

upper glumes 2-6.5 mm, 1-3-veined;

rachilla internodes 1-2.8 mm long, 0.2-0.5 mm thick, with a glandular swelling at the base;

lemmas 4.5-7.5 mm, 7(9)-veined, veins distinct, often prominent, apices truncate or emarginate, unawned or awned, awns to 11 mm;

paleal keels scabridulous, each with a 0.5-2.5 mm triangular, winglike appendage, often denticulate beyond the appendage;

anthers 2.5-4 mm.

2.5-3.1 mm.

2.5-3 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.

= 40, 42.