Flora of North America species comparison

10-70 cm;

lower nodes glabrous or hispid, hairs appressed;

upper 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;

ligules absent, ligule region frequently brown-purple;

blades 8-22 cm long, 3-6(10) mm wide, mostly glabrous, sometimes hispid, hairs papillose-based on or near the margins.

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.

2-12 cm, erect, rachises glabrous or sparsely hispid;

primary branches 5-10, 0.7-2(4) cm, erect to ascending, spikelike, somewhat distant, without secondary branches, axes glabrous or sparsely hispid, hairs 1.5-2.5 mm, papillose-based.

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.

2-3 mm, disarticulating at maturity, pubescent to hispid, hairs usually not papillose-based, tips acute to cuspidate.

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

about 1/2 as long as the spikelets;

upper glumes about as long as the spikelets;

lower florets usually sterile, occasionally staminate;

lower lemmas unawned, similar to the upper glumes;

lower paleas subequal to the lemmas;

upper lemmas 2.6-2.9 mm, not or scarcely exceeding the upper glumes, elliptic, coriaceous portion rounded distally, passing abruptly into a sharply differentiated, membranous, soon-withering tip;

anthers 0.7-0.8 mm.

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.

1.2-1.6 mm, whitish;

embryos 63-83% as long as the caryopses.

to 3 mm.

= 54.

= 54.