Flora of North America species comparison

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

nodes and internodes pubescent.

40-100 cm, erect or decumbent, sometimes rooting at the lower nodes;

internodes glabrous;

nodes 3-10, puberulent.

sometimes inflated, glabrous or pubescent;

ligules 0.5-1 mm;

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

glabrous;

ligules 0.5-0.8(2) mm;

blades 6-20 cm long, 6-20 mm wide, linear to lanceolate, flat or folded, straight or lax, glabrous (rarely sparsely pubescent) 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.

5-20 cm long, 1-3 cm wide, loosely contracted;

rachises hairy;

branches 16-30, 20-35 mm long, 0.3-0.5 mm wide, divergent to spreading, setose, not winged, with 20-35 spikelets in unequally pedicellate pairs;

pedicels 0.5-3 mm, hairy, with some hairs 0.5-2.5 mm long, at least distally.

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

4-8.8 mm long, 1.1-1.6 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 times as long as the lower lemmas, lanceolate, pilose or scabrous above, 5-veined, acuminate and awned, awns 0.5-3.5 mm;

lower florets sterile;

lower lemmas 4-8 mm long, 1.1-1.6 mm wide, lanceolate, setose, 3-7-veined, acuminate, mucronate, mucro less than 0.4 mm;

lower paleas absent;

anthers absent;

upper lemmas (2)3-4(6) mm, 0.4-0.6 times as long as the lower lemmas, indurate, elliptic, acute to rounded, 5-veined, awned, awns 0.2-0.8 mm;

upper paleas indurate, rugose.

= 54.

= 36.