Flora of North America species comparison

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.

25-75 cm, initially erect, often sprawling in the fall, nodes densely retrorsely bearded;

internodes glabrous, or pilose with papillose-based hairs;

fall phase branching from the midculm nodes, branches nearly erect, sparsely rebranching, blades and secondary panicles only slightly reduced.

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.

4-6, often with a transitional leaf above the basal rosette;

sheaths not overlapping, bases puberulent to retrorsely pilose, margins ciliate, collars pubescent;

ligules 0.4-0.9 mm, membranous, ciliate, cilia longer than the membranous portion;

blades 3-6 times longer than wide, 15-40 mm wide, ovate-lanceolate, glabrous, puberulent, or pilose, with 11-15 major veins and 40-120 minor veins, bases cordate, margins with papillose-based cilia.

4-12 cm long, 4-12 cm wide, about as long as wide when fully expanded, partially included to tardily exserted, with 16-60 spikelets.

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.

3.8-5.2 mm long, 1.7-2.2 mm wide, narrowly ellipsoid, pubescent or puberulent.

0.6-1.3 mm, subtruncate to acuminate;

lower florets sterile;

upper florets minutely apiculate.

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

upper glumes shorter than the spikelets;

lower florets usually staminate;

upper florets pointed, with a minute tuft of hairs.

rosettes well-differentiated;

blades sometimes more than 10 cm, lanceolate.

rosettes well-differentiated;

sheaths pubescent;

blades ovate to lanceolate, dark green.

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

rachises softly pubescent basally;

branches often mottled with purplish viscid spots, glabrous.

= 18.

= 18,36.