Flora of North America species comparison

10-70 cm;

lower nodes glabrous or hispid, hairs appressed;

upper nodes glabrous.

70-150 cm, erect, 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;

blades 8-35 cm long, 3-20(30) 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.

7-18 cm, erect to slightly drooping at maturity, rachises not or only sparsely hispid, nodes with papillose-based hairs;

branches numerous, appressed or ascending, spikelike, not or only sparsely hispid, hairs papillose-based;

primary branches 1.5-4 cm, glabrous or sparsely hispid, hairs to 3 mm, papillose-based;

secondary branches, if present, usually concealed by the densely packed spikelets;

longer pedicels 0.2-0.5 mm.

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

3-3.5 mm, often with 1 sterile and 2 bisexual florets, not disarticulating at maturity (particularly those near the bases of the panicles), scabrous or short-hispid but without papillose-based hairs, green and pale at maturity, apices usually obtuse, varying to acute.

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 unawned;

lower paleas subequal to the lower lemmas;

upper lemmas 2.5-3 mm, ovate to elliptic, coriaceous portion terminating abruptly at the base of the membranous tip;

anthers 0.8-1 mm.

1.2-1.6 mm, whitish;

embryos 63-83% as long as the caryopses.

1.7-2.2 mm long, 1.6-1.8 mm wide, whitish;

embryos 66-86% as long as the caryopses.

= 54.

= 54.