Flora of North America species comparison

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

nodes and internodes glabrous.

30-80(100) cm, 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.

mostly basal;

sheaths usually longer than the internodes, mostly glabrous, throat sometimes with hairs, not disintegrating into threadlike fibers;

collars glabrous or with hairs at the sides;

ligules 0.2-0.4 mm;

blades 10-25(30) cm long, 1-3 mm wide, usually flat, often curling like wood shavings when mature, glabrous.

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

rachis nodes glabrous;

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

spikelike panicles, 10-25 cm long, 1-3 cm wide;

nodes glabrous or with straight, about 0.5 mm hairs;

primary branches 2-6 cm, appressed, without axillary pulvini, with 2-8 spikelets.

in fan-shaped clusters, pedicels with axillary pulvini.

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.

10-15(18) mm, brownish, acuminate to awned, awns to 3 mm;

lower glumes slightly shorter than to equaling the upper glumes, 1-2-veined;

calluses 1-1.8 mm;

lemmas 12-18 mm, glabrous, rarely sparsely pilose, terminating in a 3-6 mm twisted column, junction with the awns not conspicuous;

awns 20-35 mm, straight to curved basally, ascending distally, not disarticulating at maturity;

central awns 20-35 mm;

lateral awns slightly shorter than the central awns;

anthers 3, 1.3-1.9 mm.

7-8 mm, smooth, chestnut brown.

= unknown.

= 22.