Flora of North America species comparison

15-45(65) cm, erect or decumbent, sometimes with crateriform glands below the nodes.

65-100 cm, erect, glabrous.

glabrous, occasionally glandular, apices hairy, hairs to 5 mm;

ligules 0.4-0.8 mm, ciliate;

blades (1)5-20 cm long, (1)3-5(10) mm wide, flat to involute, abaxial surfaces glabrous, sometimes glandular, adaxial surfaces scabridulous, occasionally also hairy.

flattened, smooth, shiny, glabrous or puberulent;

ligules 0.2-0.4 mm;

blades 15-50(70) cm long, 2-4 mm wide, folded, margins involute or revolute, abaxial surfaces glabrous or sparsely hairy, adaxial surfaces scabridulous.

(3)5-16(20) cm long, 2-8.5 cm wide, oblong to ovate, condensed to open;

primary branches 0.4-5 cm, appressed or diverging 20-80° from the rachises;

pulvini glabrous or hairy;

pedicels 0.2-3 mm, stout, straight, stiff, usually divergent, occasionally appressed.

13-28 cm long, 2-8 cm wide, narrowly oblong to narrowly lanceolate, contracted to open;

primary branches 1-8 cm, appressed or diverging up to 30° from the rachises;

pulvini glabrous or hairy;

pedicels 1-7 mm, appressed, glabrous.

6-20 mm long, 2-4 mm wide, ovate-lanceolate, plumbeous, greenish, with 10-40 florets;

disarticulation below the florets, each floret falling as a unit, rachillas persistent.

6-14 mm long, 1.3-2.5 mm wide, linear-oblong, greenish to plumbeous, with 9-14 florets;

disarticulation acropetal, paleas persistent.

broadly ovate to lanceolate, membranous, usually glandular;

lower glumes 1.2-2 mm, usually 1-veined;

upper glumes 1.2-2.6 mm, often 3-veined;

lemmas 2-2.8 mm, broadly ovate, membranous, keels with 1-3 crateriform glands, apices obtuse to acute;

paleas 1.2-2.1 mm, hyaline, keels scabrous, sometimes also ciliate, cilia to 0.3 mm, apices obtuse to acute;

anthers 3, 0.2-0.5 mm, yellow.

narrowly ovate to lanceolate, membranous to hyaline;

lower glumes 0.4-1.2 mm, scalelike;

upper glumes 1-1.5 mm;

lemmas 1.8-3 mm, ovate, membranous, strongly keeled, keels with minute punctate glands, lateral veins conspicuous, apices acute to obtuse;

paleas 1.8-3 mm, hyaline to membranous, bases not projecting beyond the lemmas, apices obtuse to truncate;

anthers 3, 1.2-1.8 mm, reddish-purple.

0.5-0.7 mm, globose to broadly ellipsoid, smooth to faintly striate, not grooved, reddish-brown or translucent.

1-1.6 mm, rectangular-prismatic to ovoid, laterally compressed, adaxial surfaces deeply grooved, smooth, opaque, reddish-brown.

= 20.

= 20.