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.

15-50 cm tall (rarely taller), 0.3-0.8 mm thick, delicate, erect or ascending;

nodes slightly swollen, often purplish or darker green than the internodes;

internodes usually puberulent;

fall phase branching profusely from the lower and midculm nodes, secondary branches and secondary panicles numerous, usually not greatly reduced.

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.

4-7;

sheaths mostly puberulent or glabrous, margins finely ciliate;

ligules 1.5-3 mm, of hairs;

blades 2-4.5 cm long, 2-5 mm wide, ascending or spreading, occasionally involute, finely appressed-pilose adaxially, puberulent abaxially, bases rounded, margins finely whitish-scabridulous.

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

0.8-1.1 mm, ellipsoid to nearly ovoid, often purplish, puberulent or subglabrous, obtuse or subacute.

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.

1/4 - 1/3 as long as the spikelets, subacute;

upper glumes shorter than the lower lemmas;

lower florets sterile;

upper florets 0.7-0.9 mm, ellipsoid, subacute.

rosettes well-differentiated;

sheaths pubescent;

blades ovate to lanceolate.

rosettes well-differentiated;

blades ovate to lanceolate.

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

panicles 2.5-5.5 cm, 1/3 – 2/3 as wide as long, well-exserted;

rachises and branches glabrous or sparsely puberulent (at least basally); ultimate branchlets and pedicels glabrous, somewhat viscid.

= 36.

= 18.