Flora of North America species comparison

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

60-150 cm tall, 2.5-5 mm thick, erect or the bases decumbent.

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.

retrorsely scabridulous to scabrous, keeled;

ligules 2-6 mm;

blades 8-36 cm long, 3-8 mm wide, abaxial surfaces smooth or scabrous, adaxial surfaces scabridulous to scabrous.

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.

10-30 cm long, 10-20 cm wide, pyramidal, open, nodding;

branches 7-20 cm, lax, divergent, often drooping, with 15-60+ spikelets;

pedicels 2.5-9 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.

3-8 mm long, (2.5)3-5 mm wide, laterally compressed, oval in side view, with 2-10 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.

narrowing from midlength or above to the broadly (> 45°) acute or rounded apices, 1-veined, veins terminating below the apices;

lower glumes 0.6-2.4 mm, ovate to rectangular;

upper glumes 1.5-2.5 mm, lanceolate;

rachilla internodes 0.2-0.5 mm;

lemmas 1.8-4 mm, ovate in dorsal view, 5-7-veined, veins evident but not raised distally, smooth over and between the veins, apices acute, prow-shaped;

paleas 0.1-0.8 mm shorter than lemmas, lengths 1.5-1.8 times widths, almost round in dorsal view, keels well developed, not winged, tips incurved, apices narrowly notched between the keels;

anthers 2, 0.4-0.5 mm, dehiscent at maturity.

1.5-2 mm.

= 40.