Flora of North America species comparison

30-70 cm, erect, sometimes geniculate, glabrous below the nodes.

(15)20-50(60) cm, erect, glabrous, often shiny below the nodes.

usually mostly glabrous, summits hairy, hairs 2-5 mm, never papillose-based;

ligules 0.2-0.3 mm;

blades (4)8-22 cm long, 1-3.5 mm wide, involute to flat, both surfaces glabrous, margins sometimes with scattered hairs, hairs to 7 mm.

pilose along the margins, apices hirsute, hairs to 7 mm;

ligules 0.2-0.5 mm, ciliate;

blades (6)8-20(30) cm long, (1)2-5 mm wide, flat, abaxial surfaces smooth, glabrous, adaxial surfaces scabridulous, with long scattered hairs.

16-28 cm long, 10-21 cm wide, ovate, open;

primary branches 0.6-15 cm, diverging up to 100° from the rachises, naked basally;

pulvini hairy;

pedicels 1.4-5(7) mm, diverging, wiry, present on all spikelets.

(10)15-45(55) cm long, (7)10-25 cm wide, to 2/3 the height of the plants, elliptic to ovate, open, rachises without glandular pits;

primary branches (2)5-15 cm, diverging 20-90° from the rachises, capillary, naked basally;

pulvini glabrous;

pedicels (4)5-25 mm, divergent, scabridulous.

2-4.5(5) mm long, 0.5-1(1.3) mm wide, narrowly lanceolate, plumbeous to reddish-purple, with 2-7 florets;

disarticulation acropetal, paleas persistent.

(1.4)2-5 mm long, 1-1.3(1.4) mm wide, ovate to lanceolate, plumbeous, occasionally reddish-purple, with 2-5(7) florets;

disarticulation acropetal, paleas persistent.

broadly ovate to narrowly lanceolate, hyaline, sometimes reddish-purple;

lower glumes 0.6-1 mm;

upper glumes 1.1-1.4 mm, usually broader than the lower glumes;

lemmas 1.2-1.8 mm, broadly ovate, mostly membranous but the distal margins hyaline, lateral veins inconspicuous, apices acute;

paleas 1.1-1.7 mm, membranous to hyaline, apices obtuse;

anthers 3, 0.2-0.7 mm, reddish-purple.

narrowly lanceolate to lanceolate, hyaline;

lower glumes 1-1.2 mm, narrower than the upper glumes;

upper glumes 1.2-1.4 mm;

lemmas 1.2-1.7 mm, broadly ovate, membranous, keels scabridulous, lateral veins inconspicuous, apices acute;

paleas 1.2-1.6 mm, hyaline, keels almost smooth to scabrous, scabridities to 0.1 mm, apices acute to obtuse;

anthers 3, 0.2-0.3 mm, reddish-brown.

0.5-0.6 mm, obovoid to somewhat prism-shaped, terete to somewhat laterally compressed, sometimes with a weak adaxial groove, finely striate, usually opaque, faintly reddish-brown to whitish.

0.4-0.7 mm, ovoid to rectangular-prismatic, adaxial surfaces deeply grooved, striate, bases reddish-brown, distal 2/3 opaque.

= 40, 80, ca. 108.

= 50, 100.