Flora of North America species comparison

(60)70-100 cm, stiffly erect, unbranched.

cauline;

sheaths longer than the internodes, mostly glabrous, summit with hairs;

collars hispid, hairs 0.2-0.8 mm;

ligules less than 0.5 mm;

blades 20-55 cm long, 2-4 mm wide, light bluish-green, flat to loosely folded, glabrous abaxially, scabridulous adaxially.

paniculate, 30-50 cm long, 15-25 cm wide;

rachis nodes glabrous or with straight hairs shorter than 0.5 mm;

primary branches 8-22 cm, ascending to divaricate or drooping, with axillary pulvini, basal portion without spikelets.

appressed along the branches.

brown to purplish, 1-veined, with a 1-2 mm awn;

lower glumes 10-13 mm, slightly longer than the upper glumes;

calluses 0.5-1 mm;

lemmas 10-12(15) mm, glabrous, light gray to brownish, narrowing to a beak, beak less than 7 mm, not or only slightly twisted, junction with the awns not conspicuous;

awns unequal, not disarticulating at maturity;

central awns 20-25 mm, straight;

lateral awns 3-10 mm, to 1/2 as long as and about 1/2 as thick as the central awns, usually divergent;

anthers 3, about 3 mm, yellow-green.

about 8 mm.

= unknown.