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.

85-130(150) cm, stiffly erect, glabrous below the nodes.

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.

glabrous or hairy at the apices, hairs to 4 mm;

ligules 0.1-0.2 mm;

blades 25-50 cm long, 1.5-6 mm wide, flat to involute, glabrous abaxially, scabridulous adaxially, sometimes also with a few scattered hairs near the base.

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.

(10)20-50(60) cm long, 2-8(10) cm wide, narrowly ovate, contracted to open;

primary branches mostly 2-14 cm, appressed or diverging up to 50°(90°) from the rachises, spikelets congested near the base of the branches;

pulvini glabrous;

pedicels 0.3-2.4 mm, appressed, always shorter than the spikelets.

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.

3.2-10(12) mm long, 0.7-1.4 mm wide, linear-lanceolate, stramineous to plumbeous, sometimes with a reddish tinge, with (5)8-25 florets;

disarticulation acropetal, glumes first, then the lemmas, paleas 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.

subequal, ovate to lanceolate, hyaline;

lower glumes 1-1.5 mm;

upper glumes 1.1-1.6 mm;

lemmas 1.1-1.8(2) mm, ovate, membranous, apices acute;

paleas 0.8-1.7 mm, hyaline, narrower than the lemmas, apices obtuse to truncate;

anthers 2, 0.2-0.3 mm, purplish.

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

0.6-0.9 mm, ovoid, flattened ventrally, finely striate, reddish-brown.

= 40.

= 40.