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.

20-55 cm, most forming in the spring additional culms sometimes produced in the fall;

nodes glabrous or sparsely ascending-pubescent;

internodes all elongated, glabrous or puberulent;

fall phase with a few suberect branches from the lower and midculm nodes, branches not rebranching, blades slightly reduced, secondary panicles partially exserted.

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.

3-4;

lower sheaths not overlapping, sometimes pubescent;

upper sheaths overlapping, sparsely to densely pubescent, hairs papillose-based, margins ciliate;

ligules 0.3-0.5 mm, membranous, ciliate, cilia longer than the membranous bases;

blades 7-17 cm long, 7-23 mm wide, erect, pale yellow-green to bluish-green, glabrous, with 7-11 prominent major veins and 30-110 minor veins, bases tapered or rounded to truncate, margins with papillose-based cilia.

7-14 cm long, 1-5 cm wide, their length usually more than twice their width, narrowly cylindric, eventually well-exserted, with 9-46 spikelets;

branches strongly ascending, stiff.

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

3.2-4.1 mm long, 1.8-2.2 mm wide, obovoid, turgid, puberulent to subglabrous, with rounded apices.

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.

1.7-2.2 mm, narrowly triangular;

lower florets staminate;

upper florets longer than the upper glumes, mucronate.

rosettes well-differentiated;

sheaths pubescent;

blades ovate to lanceolate.

rosettes often poorly differentiated;

blades few, grading into the cauline blades.

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

= 36.

= 36.