Flora of North America species comparison

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

(12)25-75 cm, usually erect, sometimes geniculate and branched below, glabrous, reddish.

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, apices usually with 0.3-2.2 mm hairs;

ligules 0.2-0.4 mm, ciliate;

blades (5)7-17 cm long, 1-3 mm wide, flat to folded basally, involute apically, abaxial surfaces glabrous, adaxial surfaces scabridulous, sometimes with 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.

(6)11-21 cm long, 1-13 cm wide, ovate to somewhat contracted, open;

primary branches 0.5-12 cm, (12)15-20 per culm, appressed or diverging up to 60° from the rachises, often capillary, naked near the base;

pulvini glabrous;

pedicels 0.3-5 mm, mostly appressed.

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.

2-4.6 mm long, 0.9-2 mm wide, narrowly ovate, greenish-yellow to plumbeous and with a reddish-purple tinge, with 5-15 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.

lanceolate to ovate, membranous;

lower glumes 0.4-0.9 mm;

upper glumes 1-1.3 mm, occasionally 3-veined;

lemmas 1-1.3 mm, broadly ovate, membranous, often reddish-purple, lateral veins conspicuous, often greenish, apices acute;

paleas 0.9-1.1 mm, hyaline, keels scabridulous, apices obtuse;

anthers 2, 0.1-0.2 mm, reddish-purple.

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

0.3-0.5 mm, subglobose to obovoid, not grooved, translucent, faintly striate, reddish-brown.

= 20.

= 80.