Flora of North America species comparison

30-150 cm;

nodes glabrous.

1-2 m tall, to 1 cm thick, erect or decumbent and rooting at the lower nodes, upper portion sometimes floating distally;

nodes glabrous or antrorsely villous.

glabrous, often purplish;

ligules absent;

blades 12-60 cm long, 10-25 mm wide, glabrous.

mostly glabrous, minutely puberulent, or hispid, hairs papillose-based, throat hispid;

ligules present on the lower leaves, 1-5 mm, of stiff hairs;

blades 15-70 cm long, 5-13 mm wide, glabrous.

10-30 cm, erect or drooping, nodes sparsely hispid, hairs papillose-based, internodes glabrous;

primary branches to 14 cm, nodes sometimes sparsely hispid, hairs papillose-based, internodes usually glabrous;

secondary branches to 3 cm.

13-45 cm, erect, rachis nodes hispid, hairs 3-6.5 mm, papillose-based, internodes scabrous;

primary branches 4-10 cm, subverticillate, ascending, nodes hispid, hairs 2.5-4 mm, papillose-based, internodes scabrous;

secondary branches short, spikelets subsessile, in clusters.

2.5-3.4 mm long, 1.2-1.4 mm wide, disarticulating at maturity.

4-7 mm, hispid, hairs appressed, disarticulating at maturity.

1.2-1.5 mm long, 1-1.3 mm wide;

embryos 50-70% as long as the caryopses.

to 3 mm.

glumes subequal to the spikelets;

lower florets sterile;

lower lemmas unawned or awned, awns 3-10(15) mm, curved;

lower paleas absent, vestigial, or well-developed;

upper lemmas narrowly elliptic, not or scarcely exceeding the upper glumes, acute or obtuse, with a well-differentiated, early-withering tip, glabrous or pubescent at the base of the tip, hairs not forming a line across the base;

anthers 0.5-0.7 mm.

glumes at least 1/2 as long as the spikelets;

lower florets staminate;

lower lemmas apiculate or awned, awns to 18 mm;

lower paleas subequal to the lower lemmas, often purple;

anthers of lower florets 1.5-3.6 mm, orange;

upper lemmas 2.5-5 mm, elliptic or narrowly ovate, apices obtuse, with a membranous, soon-withering tip;

anthers of upper florets shorter than those of the lower florets.

= 36.

= 54.