Flora of North America species comparison

30-150 cm;

nodes glabrous.

40-150 cm, erect or nearly so, densely tufted;

lower nodes usually antrorsely scabrous or villous;

upper nodes glabrous.

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

glabrous, often purplish;

ligules absent;

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

glabrous;

ligules absent, ligule region sometimes pubescent;

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

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.

8-20 cm, erect to slightly drooping, rachis nodes hispid,with papillose-based hairs to 5.6 mm, internodes usually scabrous, sometimes also with a few papillose-based hairs;

primary branches to 4 cm.

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.

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

4-6 mm, ovoid to ellipsoid, 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.

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

embryos 50-70% as long as the caryopses.

1.7-2.6 mm, brownish;

embryos 89-98% as long as the caryopses.

1.2-2.3 mm, brownish;

embryos 84-96% 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 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.

sheaths densely pubescent;

upper sheaths glabrous or pubescent at the throat, and sometimes on the collar;

ligules absent;

blades stiff, ascending, lower blades pubescent, upper blades usually glabrous.;

lower glumes usually at least 1/2 as long as the spikelets;

upper glumes equaling or exceeding the upper florets;

lower florets sterile;

lower lemmas often thickened and somewhat coriaceous, unawned or awned, awns to 1.5 mm;

lower paleas well-developed;

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

anthers 0.9-1.2 mm.

= 36.

= 36.

= 54.