Flora of North America species comparison

100-200 cm tall, 3-5 mm thick, smooth.

50-150 (200) cm tall, 8-12 mm thick, erect or decumbent and rooting at the base.

smooth or scabridulous, weakly keeled;

ligules 1-1.5 mm, truncate;

blades to 45 cm long, 6-10 mm wide, abaxial surfaces smooth or scabrous, adaxial surfaces scabrous.

smooth or scabridulous, keeled;

ligules 1-5 (7) mm, truncate to rounded, ligules of the lower leaves stiff at the base, ligules of the upper leaves flexible throughout;

blades 25-43 cm long, 4.5-15 mm wide.

20-30 cm long, 7.5-14 cm wide, open, pyramidal;

branches 7.5-14 cm, spreading or reflexed, lax, with 16-80 spikelets;

pedicels 2-7 mm.

16-42 cm long, 12-20 cm wide, open;

branches (7)10-18 cm, lax, widely divergent to drooping, with 35-80+ spikelets;

pedicels 1-15 mm.

3.5-5.5 mm long, 2-3(3.5) mm wide, laterally compressed, oval in side view, with 3-5 florets.

3.2-10 mm long, 2-3 mm wide, somewhat laterally compressed, oval to elliptic in side view, with 4-10 florets.

tapering from below midlength to the narrowly (< 45°) acute apices, veins not extending to the apices;

lower glumes 0.8-1.5 mm;

upper glumes 1.8-2.2 mm;

rachilla internodes about 0.5 mm;

lemmas 2.2-2.7 mm, 0.9-1.1 mm wide in dorsal view, veins distinctly raised, usually smooth over and between the veins, sometimes scabridulous over the veins, apices acute, prow-shaped;

paleas slightly shorter than the lemmas, lengths 2-2.7 times widths, keels not winged, tips incurved, apices narrowly notched between the keels;

anthers 2, about 1.5 mm, dehiscent at maturity.

mostly hyaline, usually the midvein of 1 or both glumes extending to the apices, apices acute;

lower glumes 1-2.3 mm;

upper glumes 1.5-2.7 mm;

rachilla internodes 0.5-0.8 mm;

lemmas 1.8-3 mm, prominently (5)7-veined, veins often scabridulous, intercostal regions smooth, apices rounded to truncate, sometimes erose, almost flat at maturity;

paleas from shorter than to slightly longer than the lemmas, lengths more than 3 times widths, keels not winged, ciliolate, tips not strongly incurved, truncate to notched between the keels;

anthers 3, 0.5-1.2 mm.

about 1.5 mm.

1-1.5 mm.

= 40.

=20.