Flora of North America species comparison

(5)10-60 cm, erect or decumbent, much-branched near the base, with a ring of glandular tissue below the nodes, rings often shiny or yellowish.

75-100 cm, erect, glabrous.

hairy at the apices, hairs to 4 mm;

ligules 0.2-0.5 mm, ciliate;

blades 1.5-10 cm long, 1-3(5) mm wide, flat, abaxial surfaces glabrous, adaxial surfaces glabrous, sometimes scabridulous, occasionally with white hairs to 3 mm, margins without crateriform glands.

hirtellous on the margins when immature, apices glabrous or hairy shorter than 0.5 mm;

ligules 0.2-0.3 mm;

blades 20-40 cm long, 2-5(6) mm wide, flat to involute, glabrous abaxially, scabrous adaxially.

4-20 cm long, 2.2-8(10) cm wide, ovate, open to contracted, rachises with shiny or yellowish glandular spots or rings below the nodes;

primary branches 0.5-6 cm, diverging 20-100° from the rachises;

pulvini glabrous;

pedicels 1-4 mm, stout, stiff, divergent, without glandular bands.

22-40 cm long, 0.3-0.6 cm wide, spikelike, dense;

primary branches shorter than 1.2 cm, closely appressed, spikelet-bearing to the base;

pulvini glabrous;

pedicels 0.1-0.6 mm, mostly appressed, hirtellous.

4-7(11) mm long, 1.1-2.2 mm wide, narrowly ovate, reddish-purple to greenish, occasionally grayish, with 7-12(20) florets;

disarticulation acropetal, paleas persistent.

1.4-2.2 mm long, 0.9-1.2 mm wide, ovate, stramineous to light greenish, with 2-3 florets;

disarticulation basipetal, in the rachilla below the individual florets or at the base of the florets, glumes persistent.

broadly ovate, membranous, 1-veined;

lower glumes 0.9-1.4 mm;

upper glumes 1.2-1.6 mm;

lemmas 1.4-1.8 mm, broadly ovate, membranous, apices acute to obtuse;

paleas 1.3-1.7 mm, hyaline, keels scabrous, scabridities to 0.1 mm, apices obtuse to acute;

anthers 3, 0.1-0.2 mm, reddish-brown.

elliptic to ovate, hyaline, keels ciliolate;

lower glumes 0.7-1 mm;

upper glumes 0.9-1.3 mm, apices obtuse;

lemmas 1.5-2.1 mm, ovate, membranous to hyaline, apices acute to obtuse;

paleas 1.1-1.6 mm, hyaline, not wider than the lemmas, apices obtuse;

anthers 2, 0.3-0.4 mm, reddish-brown.

0.4-0.7 mm, ellipsoid, not grooved, smooth to faintly striate, light brown.

0.7-1 mm, ellipsoid, somewhat ventrally flattened, smooth to faintly striate, reddish-brown.

= 40.

= 40.