Flora of North America species comparison

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

75-100 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.

hirtellous on the margins when immature, apices glabrous or hairy shorter than 0.5 mm;

ligules 0.2-0.3 mm;

blades 20-40 cm long, 2-5(6) mm wide, flat to involute, glabrous abaxially, scabrous adaxially.

(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.

22-40 cm long, 0.3-0.6 cm wide, spikelike, dense;

primary branches shorter than 1.2 cm, closely appressed, spikelet-bearing to the base;

pulvini glabrous;

pedicels 0.1-0.6 mm, mostly appressed, hirtellous.

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.

1.4-2.2 mm long, 0.9-1.2 mm wide, ovate, stramineous to light greenish, with 2-3 florets;

disarticulation basipetal, in the rachilla below the individual florets or at the base of the florets, glumes 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.

elliptic to ovate, hyaline, keels ciliolate;

lower glumes 0.7-1 mm;

upper glumes 0.9-1.3 mm, apices obtuse;

lemmas 1.5-2.1 mm, ovate, membranous to hyaline, apices acute to obtuse;

paleas 1.1-1.6 mm, hyaline, not wider than the lemmas, apices obtuse;

anthers 2, 0.3-0.4 mm, reddish-brown.

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

0.7-1 mm, ellipsoid, somewhat ventrally flattened, smooth to faintly striate, reddish-brown.

= 20.

= 40.