Flora of North America species comparison

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

50-100 cm tall, 3-5 mm thick, erect.

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, not or only weakly keeled;

ligules 0.2-0.9 mm, translucent, rounded to truncate;

blades 25-40 cm long, 2-7 mm wide, abaxial surfaces smooth, adaxial surfaces 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.

15-25 cm long, 0.8-1.5 cm wide, linear, nodding;

branches 5-9 cm, appressed, scarcely surpassing the node above, with 30-60+ spikelets;

pedicels 0.5-2 mm.

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

3.5-5 mm long, 1-2.5 mm wide, laterally compressed, oval in side view, with 3-4 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.

lanceolate, veins terminating below the apices, apices acute;

lower glumes 1.3-2.4 mm;

upper glumes 1.7-3 mm;

rachilla internodes 0.4-0.6 mm;

lemmas 1.9-2.8 mm, smooth or scabridulous, 5-7-veined, veins raised, apices acute, prow-shaped;

paleas slightly shorter to slightly longer than the lemmas, lengths 2.5-4 times widths, keels well developed, not winged, tips incurved, narrowly notched between the keels;

anthers 2, 0.3-0.5 mm.

about 1.5 mm.

1-1.5 mm;

hila subequal to the caryopses.

= 40.

= 40.