Flora of North America species comparison

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

10-50 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.

mostly basal;

sheaths mostly glabrous, apices pilose, hairs 0.4-3 mm;

ligules 0.1-0.2 mm, ciliate;

blades (1.8)5-12 cm long, 2-6 mm wide, flat to involute, abaxial surfaces glabrous, adaxial surfaces scabridulous and glabrous or sparsely hairy, hairs appressed.

(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.

6-15 cm long, 0.5-7 cm wide, ovate, open to contracted;

primary branches 0.2-5 cm, appressed or diverging up to 70° from the rachises, glabrous;

pulvini glabrous;

pedicels 2-8 mm, 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.

4-8(10) mm long, (1.6)2-4 mm wide, ovate-lanceolate, loosely imbricate, straw-colored to purplish, with 12-42 florets;

disarticulation acropetal, paleas not persistent, rachillas 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.

ovate-lanceolate to lanceolate, hyaline to membranous;

lower glumes 1-1.8 mm;

upper glumes 1-2.2 mm;

lemmas 1.5-1.9 mm, broadly ovate, membranous, lateral veins raised, apices obtuse to acute;

paleas 1.4-1.9 mm, hyaline, keels scabridulous, apices acute to obtuse;

anthers 2, 0.2-0.4 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, ellipsoid, laterally compressed, not grooved, smooth, light brown.

= 20.

= 20, ca. 30.