Flora of North America species comparison

30-150 cm;

nodes glabrous.

70-150 cm, erect, glabrous.

glabrous, often purplish;

ligules absent;

blades 12-60 cm long, 10-25 mm wide, glabrous.

glabrous;

ligules absent;

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

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.

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.

2.5-3.4 mm long, 1.2-1.4 mm wide, disarticulating at maturity.

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.

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

embryos 50-70% 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.

glumes 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.

glumes 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.

= 36.

= 54.