Flora of North America species comparison

10-70 cm;

lower nodes glabrous or hispid, hairs appressed;

upper nodes glabrous.

80-150 cm tall, 4-10 mm thick, glabrous.

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, ligule region sometimes pubescent;

blades 10-50 cm long, 5-25 mm wide.

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.

7-30 cm, dense, rachis nodes densely hispid, hairs papillose-based, internodes scabrous;

primary branches 2-5 cm, erect or spreading, simple or branched, often incurved at maturity, nodes hispid, hairs papillose-based, internodes usually scabrous;

longer pedicels 0.5-1 mm.

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

3-4 mm long, 2-2.5 mm wide, not or only tardily disarticulating at maturity, obtuse to shortly acute, purplish to blackish-brown 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.

narrower and shorter than the upper lemmas;

lower florets sterile;

lower lemmas usually unawned;

lower paleas shorter and narrower than the lemmas;

upper lemmas longer and wider than the upper glumes, broadly ovate to ovate-orbicular, shortly apiculate, exposed distally at maturity;

anthers 1-1.2 mm.

1.2-1.6 mm, whitish;

embryos 63-83% as long as the caryopses.

1.2-2.3 mm, brownish;

embryos 84-96% as long as the caryopses.

= 54.

= 54.