Flora of North America species comparison

50-100 (150) cm tall, 3-8 mm thick, spongy, erect to decumbent and rooting at the lower nodes.

60-100 cm tall, 2.5-5 mm thick, often decumbent at the base.

finely scabridulous, not or weakly keeled;

ligules 4.5-12 mm, lacerate;

blades 12-30 cm long, 3.5-11 mm wide, both surfaces sometimes scabridulous, adaxial surfaces sometimes sparsely papillose.

glabrous, smooth, not keeled, midvein prominent;

ligules 0.5-0.8 mm, not translucent, truncate to slightly rounded;

blades 15-40 cm long, 2-8 mm wide, abaxial surfaces smooth, adaxial surfaces scabridulous.

20-40 cm long, 2.5-8 cm wide;

branches 4.2-14.7 cm, appressed to ascending, with 3-8(10) spikelets;

pedicels 2-5 mm, scabrous.

5-15 cm long, 2.5-6 cm wide, ovoid, erect, dense;

branches 2.5- 8 cm, strongly ascending, with 10-30 spikelets;

pedicels 1-14 mm.

9-20 mm long, 0.4-3 mm wide, cylindrical and terete, except at anthesis when slightly laterally compressed, rectangular in side view, with 6-15 florets.

4-7 mm long, 2.5-4 mm wide, somewhat laterally compressed, oval in side view, with 4-7 florets.

broadly rounded to acute;

lower glumes 0.6-2.1 mm;

upper glumes 1.4-3.4 mm;

rachilla internodes 1-1.5 mm;

lemmas 2.6-4.5 mm, somewhat indented below the apical margins at maturity, veins raised, scabridulous to scabrous over and between the veins, prickles about 0.05 mm, midveins extending to within 0.1 mm of the apical margins, apices truncate to obtuse, crenulate;

paleas shorter than or equaling the lemmas, keels winged, tips parallel, intercostal region truncate or rounded, sometimes exceeding the keel tips;

anthers 3, 0.3-0.9 mm.

keeled, 1-veined, veins not extending to the apical margins, apical margins hyaline, acute, entire or often splitting with age;

lower glumes 1.6-2.5 mm, lanceolate to narrowly ovate or obovate;

upper glumes 1.7-3.5 mm, ovate-elliptic to obovate, obtuse to rounded;

rachilla internodes 0.2-0.4 mm;

lemmas 3-3.9 mm, 5-9-veined, veins not raised, apices rounded, somewhat prow-shaped;

paleas subequal to the lemmas, lengths 2-2.8 times widths, keels well-developed, not winged, tips pointing towards each other, narrowly notched between the keels;

anthers 2, 0.6-0.8 mm.

1.5-1.8 mm.

= 40.

= 40.