Flora of North America species comparison

(3)10-50(80) cm, often highly branched above the base.

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

nodes and internodes glabrous.

cauline, glabrous;

sheaths shorter than the internodes, not disintegrating into threadlike fibers;

ligules 0.4-1 mm;

blades 2-14 cm long, 1-2.5 mm wide, flat to involute.

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.

panicles, 5-15(20) cm long, 0.5-3 cm wide, often interrupted below;

nodes glabrous or with straight, less than 0.5 mm hairs;

primary branches 1-4 cm, erect to ascending, without axillary pulvini, with 3-8 spikelets.

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

rachis nodes glabrous;

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

crowded.

in fan-shaped clusters, pedicels with axillary pulvini.

unequal, 1-veined, acuminate;

lower glumes 4-8 mm;

upper glumes 6-11 mm;

calluses 0.5-0.8 mm;

lemmas 6-9 mm, slightly keeled, midveins scabrous, junction with the awns not evident;

awns not disarticulating at maturity, flattened and straight to somewhat curved at the base, central rib flanked by equally wide pale wings;

central awns 7-15(20) mm;

lateral awns somewhat shorter, occasionally only 1-2 mm;

anthers 3, 0.3-0.7 mm.

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.

7-8 mm, smooth, chestnut brown.

= 22.

= unknown.