Flora of North America species comparison

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

20-150 cm tall, 2-4 mm thick, erect or spreading, sometimes decumbent and rooting from the lower nodes, distal portion sometimes floating in shallow water.

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.

glabrous, keeled;

ligules 5-15 mm;

blades 5-25 cm long, 3-10 mm wide, both surfaces smooth.

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.

10-50 cm long, 2-3 cm wide;

branches 3-5 cm, paired or solitary, usually appressed to ascending, divergent at anthesis, with 1-4 spikelets;

pedicels 0.8-20 mm.

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

(15)18-39 mm long, 1.7-3.3 mm wide, cylindrical and terete, except slightly laterally compressed at anthesis, rectangular in side view, with 8-16 florets.

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.

1.3-3.9 mm;

upper glumes 2.7-5 mm;

rachilla internodes 1.9-2.5 mm;

lemmas 5.2-8 mm, midveins extending to within 0.1 mm of the apical margins, scabrous over and between the veins, prickles about 0.05 mm, apices acute, usually entire;

paleas from shorter than to 0.6(1.5) mm longer than the lemmas, keels winged, apices bifid, teeth 0.1-0.4 mm, parallel to convergent, sometimes crossing when dry;

anthers 1.5-3 mm, usually purple.

1.5-2 mm.

2-3 mm.

= 40.