Flora of North America species comparison

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

70-110 cm, 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.

hairy at the apices and sometimes on the upper margins, hairs to 4 mm, not papillose-based;

ligules 0.2-0.4 mm;

blades (8)12-30 cm long, 1.5-3.8 mm wide, flat to involute, abaxial surfaces glabrous, adaxial surfaces scabridulous, glabrous or sparsely hairy, hairs to 4 mm.

(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.

25-45 cm long, (5)12-30 cm wide, broadly ovate, open;

primary branches mostly 4-20 cm, diverging 20-90° from the rachises, capillary, sinuous;

pulvini glabrous or hairy;

pedicels 1-18 mm, appressed or divergent, proximal spikelets on each branch usually with pedicels shorter than 5 mm.

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.

5-9 mm long, 1-3 mm wide, lanceolate, plumbeous, with 5-12 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.

lanceolate to ovate, membranous;

lower glumes 1.3-2.4 mm;

upper glumes 1.6-2.6 mm;

lemmas 2.4-3 mm, ovate, mostly membranous, hyaline near the margins and apices, lateral veins inconspicuous, apices acute;

paleas 1.5-3 mm, hyaline, narrower than the lemmas, apices obtuse to truncate;

anthers 3, 0.6-1.7 mm, purplish.

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

0.8-1.6 mm, subellipsoid, terete to somewhat laterally compressed, with a well-developed adaxial groove, faintly striate, opaque, reddish-brown.

= 20.

= unknown.