Flora of North America species comparison

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

nodes and internodes pubescent.

40-80 cm, erect, not rooting at the lower nodes;

internodes glabrous;

nodes hairy.

sometimes inflated, glabrous or pubescent;

ligules 0.5-1 mm;

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

glabrous, rarely with a few appressed hairs;

collars glabrous;

ligules 0.4-1 mm;

blades 10-20 cm long, 2-4 mm wide, linear, flat, straight, spreading, glabrous or hairy 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.

5-15 cm long, 0.3-1 cm wide;

rachises scabrous;

branches 2-8, 25-45 mm long, 0.3-0.6 mm wide, divergent to spreading, glabrous, winged, with 2-40 spikelets in unequally pedicellate pairs at the middle of the branches;

pedicels 1-3 mm, glabrous, apices hairy.

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

3.6-5.4 mm long, 1.1-1.4 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.

1-1.3 times as long as the lower lemmas, lanceolate, hairy, 5-veined, acuminate, awned, awns 0.5-1.5 mm;

lower florets sterile;

lower lemmas 3.5-5.2 mm long, 1.1-1.4 mm wide, lanceolate, setose, 5-veined, mucronate to awned;

lower paleas absent;

upper lemmas 2.1-3.7 mm, elliptic, apices rounded, awned, awns 0.4-0.8 mm;

upper paleas indurate, blunt, not rugose.

= 54.

= 36.