Flora of North America species comparison

30-150 cm;

nodes glabrous.

to 150 cm, erect.

glabrous, often purplish;

ligules absent;

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

glabrous;

ligules absent;

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

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.

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.

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

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.

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

embryos 50-70% as long as the caryopses.

1.5-1.8 mm.

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 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.

= 36.

= unknown.