Flora of North America species comparison

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

5-40 cm, erect, glabrous, occasionally with oblong glandular areas 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 on the distal margins and at the apices, hairs to 4 mm, stiff;

ligules 0.2-0.3 mm;

blades 2-8 cm long, 2-4 mm wide, flat to involute, abaxial surfaces smooth, adaxial surfaces scabridulous, bases occasionally with papillose-based hairs.

(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.

4-15 cm long, 1-7 cm wide, cylindrical to narrowly ovate, open, rachises sometimes glandular below the nodes;

primary branches 0.5-4 cm, diverging 20-100° from the rachises;

pulvini sparsely pilose;

pedicels 1-4(7) mm, as long as or longer than the spikelets, mostly pendent, lax, terete.

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)1.5-2.5 mm long, 0.9-1.4 mm wide, ovate to oblong, reddish-purple to greenish, with 4-8 florets;

disarticulation basipetal, 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.

ovate, hyaline, keeled, veins commonly green;

lower glumes 0.4-0.7 mm;

upper glumes 0.7-1 mm;

lemmas 0.7-1.1 mm, ovate to broadly oblong, membranous, lateral veins usually greenish, apices truncate to obtuse;

paleas 0.6-1.1 mm, hyaline, keels ciliate, cilia 0.3-0.5 mm, apices obtuse to truncate;

anthers 3, about 0.2 mm, purplish.

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

0.3-0.5 mm, ellipsoid, translucent, light brown.

= 20.

= 20.