Flora of North America species comparison

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

75-150 cm tall, 2.5-8 mm thick, spongy, decumbent and rooting at the lower nodes.

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.

scabridulous or hirtellous, not or weakly keeled;

ligules 2.5-4(6) mm, truncate to acute, erose, puberulent;

blades 19-40+ mm long, 6-12(15) mm wide, abaxial surfaces smooth or scabridulous, adaxial surfaces usually scabrous, sometimes scabridulous.

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.

15-30 cm long, 12-30 cm wide, pyramidal, open;

branches 12-17 cm, divergent to drooping, lax, with 30-50+ spikelets;

pedicels 0.3-5 mm.

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

3-6 mm long, 1.5-2.8 mm wide, laterally compressed, oval in side view, with 3-4(6) 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.

1-1.5(2) times longer than wide, narrowing beyond midlength, veins terminating below the apical margins, apices obtuse to rounded;

lower glumes 0.7-1.5 mm;

upper glumes 1-1.5 mm;

rachilla internodes 0.5-0.6 mm;

lemmas 1.7-2.2 mm, oval in dorsal view, 5-7-veined, veins raised throughout, scabridulous, apices rounded, prow-shaped;

paleas subequal to or often slightly longer than the lemmas, lengths 2.4-3 times widths, oval in dorsal view, keels not winged, tips pointing towards each other, apices narrowly notched between the keels;

anthers 2, 0.5-0.8 mm.

about 1.5 mm.

0.8-1.5 mm long, 0.5-0.7 mm wide;

hila as long as the caryopses.

= 40.

= 20.