Flora of North America species comparison

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

nodes and internodes pubescent.

30-150 cm, erect or decumbent, not rooting at the lower nodes;

internodes glabrous;

nodes 3-10, glabrate.

sometimes inflated, glabrous or pubescent;

ligules 0.5-1 mm;

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

occasionally inflated, glabrous (rarely puberulent), often purplish at maturity;

ligules 0.4-1 mm;

blades 10-50 cm long, (2)4-10(13) mm wide, linear, flat, straight, spreading, glabrous (rarely puberulent) on both surfaces.

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.

9-22 cm long, 1-10 cm wide, contracted, rarely open;

rachises scabrous to densely pubescent;

branches (4)8-20(27), 1-6 cm long, 0.3-0.5 mm wide, appressed or divergent, glabrous, not winged, with 28-60 spikelets, spikelets mostly in unequally pedicellate pairs, solitary distally;

pedicels 0.1-0.7 mm, uniformly pubescent, hairs about 0.1 mm.

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

(4)4.5-5.7 mm long, 0.9-1.4 mm wide.

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.

equaling the lower lemmas, lanceolate, sparsely appressed pilose, 5-7-veined, acuminate, sometimes mucronate, mucro shorter than 0.5 mm;

lower lemmas 4.3-5.5 mm long, 0.9-1.4 mm wide, lanceolate, setose, 5-7-veined, acuminate, unawned or mucronate;

lower paleas absent;

anthers absent;

upper lemmas 2-3.5 mm (excluding the awn), 0.4-0.6 times as long as the lower lemmas, indurate, elliptic, 5-veined, rounded, awned, awns 0.6-1.5 mm;

upper paleas 0.5-1.2 mm, indurate, blunt.

= 54.

= 36.