Flora of North America species comparison

8-45(70) cm, erect or geniculate, glabrous, occasionally with a few glandular depressions.

45-95 cm, erect, glabrous.

mostly glabrous, occasionally glandular, apices hirsute, hairs to 3 mm;

ligules 0.1-0.3 mm, ciliate;

blades 2-15(20) cm long, 1-2.5(4) mm wide, flat, abaxial surfaces glabrous, occasionally with glandular pits along the midrib, adaxial surfaces scabridulous.

hairy at the apices and on the margins, hairs to 6 mm;

ligules 0.5-1.2 mm;

blades 7-30 cm long, 2.5-7 mm wide, flat to loosely involute, glabrous abaxially, scabrous adaxially, margins sharply scabrous.

4-20(28) cm long, 2-15(18) cm wide, ellipsoid to ovoid, diffuse;

primary branches 1-10 cm, diverging 10-80°(110°) from the rachises, capillary, whorled on the lowest 2 nodes, rarely glandular;

pulvini glabrous or hairy;

pedicels 1-10 mm, flexible, appressed or divergent.

10-30 cm long, 1-6 cm wide, oblong, condensed, interrupted below;

primary branches 1-11 cm, appressed or diverging to 40° from the rachises, naked basally;

pulvini glabrous;

pedicels 0.5-25 mm, with a narrow band or abscission line below the apices.

(2)3.5-6(10) mm long, 0.6-1.4 mm wide, linear-oblong to narrowly ovate, plumbeous, with (3)5-17 florets;

disarticulation acropetal, paleas tardily deciduous, rachillas persisting longer than the paleas.

5.5-16 mm long, 2.7-9 mm wide, ovate, flattened, greenish to stramineous, sometimes with a reddish-purple tinge, with 4-22 florets;

disarticulation below the glumes, spikelets falling intact.

narrowly ovate to lanceolate, hyaline;

lower glumes 0.3-0.6(0.8) mm;

upper glumes 0.7-1.2(1.4) mm;

lemmas 1.2-1.8(2) mm, ovate-lanceolate, membranous to hyaline, grayish-green proximally, reddish-purple distally, lateral veins inconspicuous, apices acute;

paleas 1-1.6 mm, membranous to hyaline, keels scabridulous to scabrous, apices obtuse;

anthers 3, 0.2-0.3 mm, purplish.

equal, 3-4.5 mm, ovate, chartaceous;

lemmas 3-5 mm, broadly lanceolate, chartaceous to leathery, lateral veins green, apices acute;

paleas 3-5 mm, chartaceous to hyaline, keels broadly winged below, forming a wing or tooth on each side that often projects beyond the lemma bases, apices acuminate;

anthers 3, 1.4-2.8 mm, golden-yellow.

0.5-1 mm, obovoid to prism-shaped, adaxial surfaces flat, smooth to faintly striate, light brown.

1-2 mm, ellipsoid, adaxial surfaces flattened, reddish-brown.

= 40.

= 40.