Flora of North America species comparison

60-160 cm tall, 2.5-5 mm thick, erect or decumbent and rooting from the lower nodes.

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

smooth to scabridulous, keeled, sometimes weakly so;

ligules 7-12 mm;

blades 20-30 cm long, (2.5)4-12 mm wide, adaxial surfaces scabridulous, occasionally papillose.

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.

20-50 cm long, 2-15 cm wide, usually narrow, open at anthesis;

branches 4.5-18 cm, somewhat lax, usually ascending, strongly divergent at anthesis, with 2-8 spikelets, pedicels 1.5-8 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.

13-23 mm long, 1.5-3.5 mm wide, cylindrical and terete, except at anthesis when slightly laterally compressed, rectangular in side view, with 6-13 florets.

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

acute to obtuse;

lower glumes 1.1-2.8 mm;

upper glumes 2.9-3.7 mm, about twice as long as the lower glumes;

rachilla internodes 1-2.8 mm;

lemmas 4.5-5.9 mm, scabridulous, midveins extending to within 0.1 mm of the apical margins, apices acute, usually slightly lobed or irregularly crenate;

paleas usually shorter than or equaling the lemmas, sometimes slightly longer, keels winged, apices shallowly notched to slightly bifid, teeth to 0.2 mm, parallel;

anthers 2, 0.6-1.6 mm.

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.

1-1.5 mm.

= 40.

=20.