Flora of North America species comparison

10-70 cm;

lower nodes glabrous or hispid, hairs appressed;

upper nodes glabrous.

30-150 cm;

nodes 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, often purplish;

ligules absent;

blades 12-60 cm long, 10-25 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.

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.

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

2.5-3.4 mm long, 1.2-1.4 mm wide, 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.

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.

1.2-1.6 mm, whitish;

embryos 63-83% as long as the caryopses.

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

embryos 50-70% as long as the caryopses.

= 54.

= 36.