Flora of North America species comparison

(30)45-80 cm, branching at the lower nodes, often diffusely so;

nodes and internodes glabrous.

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

cauline;

sheaths shorter or slightly longer than the internodes, glabrous or with straight hairs, sometimes pilose-floccose;

collars glabrous or pilose at the sides;

ligules about 0.5 mm;

blades (6)10-20 cm long, 1-2(3) mm wide, yellow-green, turning reddish late in the season, involute to loosely folded, abaxial surfaces smooth or scabrous near the base, sometimes pubescent distally, adaxial surfaces usually glabrous, sometimes scabrous or pubescent, lateral veins about twice as thick as the inner veins.

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, 10-20 cm long, 2-7 cm wide;

rachis nodes glabrous;

primary branches stiffly ascending, with axillary pulvini, with 3-9 spikelets.

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.

in fan-shaped clusters, pedicels with axillary pulvini.

appressed along the branches.

10-17 mm, about equal, light to dark brown, glabrous or rarely sparsely pilose, 1-veined, apices cleft and awned, awns 2-5 mm;

calluses 1-2.5 mm;

lemmas 7-10 mm, gray to light brown, narrowing to a 2-5(7) mm beak, junction of the lemma and awns evident;

awns 20-28 mm, similar in length, curved to strongly arcuate near the base, not forming a column, straight and divergent distally, disarticulating at maturity;

anthers 3, 1-2 mm, dark purple.

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.

7-8 mm, smooth, chestnut brown.

about 8 mm.

= unknown.

= unknown.