Flora of North America species comparison

30-200 cm, spreading, decumbent or stiffly erect;

nodes usually glabrous or the lower nodes puberulent.

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

glabrous;

ligules absent, ligule region sometimes pubescent;

blades to 65 cm long, 5-30 mm wide, usually glabrous, occasionally sparsely hirsute.

glabrous;

ligules absent, ligule region sometimes pubescent;

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

5-25 cm, with few-many papillose-based hairs at or below the nodes of the primary axes, hairs sometimes longer than the spikelets;

primary branches 1.5-10 cm, erect to spreading, longer branches with short, inconspicuous secondary branches, axes scabrous, sometimes also sparsely hispid, hairs to 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.

2.5-4 mm long, 1.1-2.3 mm wide, disarticulating at maturity.

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 as long as the spikelets;

lower florets sterile;

lower lemmas unawned to awned, sometimes varying within a branch, awns to 50 mm;

lower paleas subequal to the lemmas;

upper lemmas broadly ovate to elliptical, coriaceous portion rounded distally, passing abruptly into an early-withering, acuminate, membranous tip that is further demarcated from the coriaceous portion by a line of minute hairs (use 25x magnification);

anthers 0.5-1 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.

1.3-2.2 mm long, 1-1.8 mm wide, ovoid or oblong, brownish;

embryos 59-86% as long as the caryopses.

1.2-2.3 mm, brownish;

embryos 84-96% as long as the caryopses.

= 54.

= 54.