Flora of North America species comparison

30-100 cm, erect or decumbent, sometimes rooting at the lower nodes;

nodes and internodes pubescent.

30-120 cm, erect or decumbent, sometimes rooting at the lower nodes;

nodes and internodes glabrous.

sometimes inflated, glabrous or pubescent;

ligules 0.5-1 mm;

blades 10-20 cm long, 5-12 mm wide, flat, adaxial surfaces hairy.

smooth, glabrous;

ligules 0.5-1 mm;

blades 6-40 cm long, 3-8 mm wide, linear, flat to involute, glabrous adaxially.

3-16 cm long, 1-3 cm wide;

rachises villous;

branches 2-8, 20-70 mm long, 0.8-1.1 mm wide, velutinous, sometimes winged, with 11-24 solitary spikelets (occasionally paired proximally);

pedicels 0.5-1 mm, densely villous below, often with long hairs intermixed with the short hairs, apices with more than 12 hairs of 1.5-2.5 mm.

6-18 cm long, 0.8-3 cm wide;

rachises smooth or scabrous;

branches 3-10, 25-60 mm long, 0.4-0.6 mm wide, sometimes winged, glabrous, with 20-40 spikelets, spikelets solitary or in unequally pedicellate pairs at the middle of the branches;

pedicels 0.2-0.8 mm, glabrous or hairy below, apices with fewer than 10 hairs to 0.5 mm long.

3.9-5.2 mm long, 2-2.5 mm wide, ovate to elliptic.

2.7-3.6 mm long, 0.8-1.5 mm wide, lanceolate.

occasionally present as a scale;

upper glumes equaling the lower lemmas, ovate to elliptic, glabrous or pubescent, 7-veined;

lower lemmas 3.4-5 mm long, 2-2.5 mm wide, 5-veined, acute to apiculate, unawned;

lower paleas absent;

anthers absent;

upper lemmas 3.5-5 mm, ovate to elliptic, acute to apiculate.

1.1-1.3 times longer than the lower lemmas, hairy, 5-veined, apices acuminate and acute to awned, awns 0.3-1.5 mm;

lower lemmas 2.5-3.3 mm long, 0.8-1 mm wide, setose, apices acuminate and mucronate;

lower paleas absent;

anthers absent;

upper lemmas 1.7-2.2 mm, elliptic, acute to rounded, awned, awns 0.2-0.5 mm.

= 54.

= unknown.