Flora of North America species comparison

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

85-130(150) cm, stiffly erect, glabrous below the nodes.

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.

glabrous or hairy at the apices, hairs to 4 mm;

ligules 0.1-0.2 mm;

blades 25-50 cm long, 1.5-6 mm wide, flat to involute, glabrous abaxially, scabridulous adaxially, sometimes also with a few scattered hairs near the base.

(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.

(10)20-50(60) cm long, 2-8(10) cm wide, narrowly ovate, contracted to open;

primary branches mostly 2-14 cm, appressed or diverging up to 50°(90°) from the rachises, spikelets congested near the base of the branches;

pulvini glabrous;

pedicels 0.3-2.4 mm, appressed, always shorter than the spikelets.

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.

3.2-10(12) mm long, 0.7-1.4 mm wide, linear-lanceolate, stramineous to plumbeous, sometimes with a reddish tinge, with (5)8-25 florets;

disarticulation acropetal, glumes first, then the lemmas, 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.

subequal, ovate to lanceolate, hyaline;

lower glumes 1-1.5 mm;

upper glumes 1.1-1.6 mm;

lemmas 1.1-1.8(2) mm, ovate, membranous, apices acute;

paleas 0.8-1.7 mm, hyaline, narrower than the lemmas, apices obtuse to truncate;

anthers 2, 0.2-0.3 mm, purplish.

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

0.6-0.9 mm, ovoid, flattened ventrally, finely striate, reddish-brown.

= 20.

= 40.