Flora of North America species comparison

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

25-120 cm, wiry, erect to sprawling, unbranched.

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.

basal and cauline;

sheaths usually longer than the internodes, glabrous;

collars glabrous or strigillose;

ligules less than 0.5 mm;

blades 5-40 cm long, 1-2.5 mm wide, flat to folded, straight to lax at maturity, adaxial surfaces with scattered, 1.5-3 mm hairs near the ligule.

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, 15-40 cm long, (8)10-35(45) mm wide;

rachis nodes glabrous or strigillose;

primary branches 5-25 cm, remote, stiffly ascending to divaricate, with axillary pulvini, usually naked near the base;

secondary branches and pedicels usually appressed.

crowded.

usually congested.

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.

9-15 mm, subequal, 1-veined, acuminate;

calluses 1-1.2 mm;

lemmas 9-15 mm long, smooth to tuberculate-scabrous, narrowing to slightly keeled, usually not twisted, 0.1-0.2 mm wide apices, junction with the awns not evident;

awns not disarticulating at maturity, unequal or almost equal;

central awns 8-25(30) mm, straight to arcuate at the base;

lateral awns absent or to 0-23 mm;

anthers 3, 1.2-2.4 mm.

6-8 mm, light brownish.

= 22.

= 22, 24.