Flora of North America species comparison

50-140 cm, stout, pilose with papillose-based hairs to subglabrous;

fall phase branching from the mid- and upper culm nodes, with a few, nearly erect, elongate branches, sparsely rebranching, sheaths overlapping, concealing the secondary panicles;

nodes not swollen, glabrous or sparsely pubescent.

50-150 cm, usually robust, erect;

nodes often swollen, densely bearded with thin retrorse hairs above a constricted, glabrous, viscid ring;

internodes grayish-purple, velvety-pubescent;

fall phase branching from the mid- and upper culm nodes, with long, repeatedly forking and often recurving branches, ultimately with fascicles of reduced blades and included secondary panicles.

5-10;

sheaths not overlapping, striate-ribbed, narrowing above midlength, hispid to sparsely hirsute, hairs sometimes papillose-based, summits mottled with pale spots, margins ciliate, collars puberulent;

ligules 0.4-0.9 mm, membranous;

blades 10-25 cm long, 15-30 mm wide, flat, lanceolate, often rigid, glabrous or sparsely pubescent, with 9-13 major veins and 40-80 minor veins, bases cordate, with papillose-based cilia, apices acuminate.

7-11;

sheaths not overlapping, narrowing distally, lustrous, bases sparsely to densely retrorsely villous, hairs papillose-based, summits purplish, with yellowish spots;

collars densely villous;

ligules 0.5-2 mm, of hairs;

blades 9-20 cm long, 9-20 mm wide, thick, densely soft pubescent, bases rounded to subcordate, margins ciliate basally.

2.4-3.6 mm long, 1.2-1.5 mm wide, narrowly ellipsoid, sparsely pubescent.

2.2-2.8 mm long, 1.3-1.5 mm wide, ovoid-ellipsoid, often purplish basally, prominently veined, margins and apices sparsely to densely pubescent, hairs papillose-based.

1/3 – 1/2 as long as the spikelets, narrowly triangular;

upper glumes and lower florets slightly shorter than the spikelets, with 7 or 9 prominent veins;

lower florets sterile;

upper florets umbonate, apices with a minute tuft of hairs.

0.6-1.3 mm, subtruncate to acuminate;

lower florets sterile;

upper florets minutely apiculate.

rosettes well-differentiated;

sheaths pubescent;

blades ovate to lanceolate.

rosettes well-differentiated;

blades sometimes more than 10 cm, lanceolate.

panicles 8-16 cm long, 4-12 mm wide, exserted, with many spikelets.

panicles 6-16 cm long, 5-12 cm wide, well-exserted, dense;

rachises softly pubescent basally;

branches often mottled with purplish viscid spots, glabrous.

= 36.

= 18.