Flora of North America species comparison

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

30-70(85) cm, erect, glabrous.

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 margins and at the apices, hairs to 7 mm;

ligules 0.1-0.2 mm;

blades 10-32 cm long, 3-8 mm wide, flat to involute, both surfaces usually pilose, sometimes glabrous on both surfaces or glabrous abaxially and sparsely pilose adaxially, often with a line of hairs behind the ligules, hairs to 8 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.

(15)25-45(60) cm long, 15-35 cm wide, broadly ovate to oblong, open, basal portions sometimes included in the uppermost leaf sheaths;

primary branches (6)12-20 cm long, diverging 20-90° from the rachises, capillary, naked below;

pulvini hairy, hairs to 6 mm;

pedicels 1.5-17 mm, divergent or 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.

3-7.5 mm long, 1-2 mm wide, linear-lanceolate, reddish-purple, sometimes olivaceous, with (4)6-12 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.

subequal to equal, (1)1.3-2.3 mm, lanceolate, membranous to chartaceous;

lemmas (1)1.3-2.5 mm, ovate to lanceolate, leathery, 3-veined, apices acute;

paleas (1)1.2-2.4 mm, membranous, keels sometimes shortly ciliate, apices obtuse to truncate;

anthers 3, 0.3-0.5 mm, purplish.

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

0.6-0.8 mm, ellipsoid, strongly flattened, adaxial surfaces with 2 prominent ridges separated by a groove, reddish-brown.

= 20.

= 20, 40, 42.