Flora of North America species comparison

60-90 cm tall, 2.5-4 mm thick, erect.

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

smooth, not keeled;

ligules 2-3 mm, rounded to truncate;

blades 5-20 cm long, 3-7 mm wide, abaxial surfaces smooth, adaxial surfaces scabrous, apices acute.

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.

15-22 cm long, 12-16 cm wide, open, pyramidal, erect to nodding;

branches 8-10 cm, lower branches widely divergent to drooping.

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.

7-9 mm long, 3-4.5 mm wide, with 5-8 florets.

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

unequal, lanceolate, acute;

lower glumes 2-3.5 mm;

upper glumes 2.5-3.5 mm, longer than wide;

lemmas 3-5.5 mm, 7-veined, obtuse to acute;

paleas shorter than or subequal to the lemmas, keels not winged, apices not strongly incurved, emarginate between the keels;

anthers 3, 0.7-1.2 mm.

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.

not seen.

about 1.5 mm.

= 20.

= 40.