Flora of North America species comparison

10-70 cm;

lower nodes glabrous or hispid, hairs appressed;

upper nodes glabrous.

to 150 cm, erect.

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.

glabrous;

ligules absent;

blades 15-60 cm long, 8-20 mm wide, scabrous adaxially.

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.

8-40 cm, erect to slightly drooping, rachis nodes hispid, hairs papillose-based;

primary branches 2-19 cm, erect to spreading, often widely spaced, longer branches with secondary branching.

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

3.3-4.5 mm long, 2.4-2.6 mm wide, disarticulating at maturity, greenish or purplish, scabrous and hispid, hairs to 1 mm, often papillose-based.

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.

about as long as the spikelets;

lower florets staminate;

lower lemmas usually awned, awns 1-15 mm, purplish;

lower paleas well-developed;

upper lemmas broadly ovate, narrowing abruptly to the acute or acuminate apices;

anthers of upper florets 1.2-1.7 mm.

1.2-1.6 mm, whitish;

embryos 63-83% as long as the caryopses.

1.5-1.8 mm.

= 54.

= unknown.