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.

45-95 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.

hairy at the apices and on the margins, hairs to 6 mm;

ligules 0.5-1.2 mm;

blades 7-30 cm long, 2.5-7 mm wide, flat to loosely involute, glabrous abaxially, scabrous adaxially, margins sharply scabrous.

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.

10-30 cm long, 1-6 cm wide, oblong, condensed, interrupted below;

primary branches 1-11 cm, appressed or diverging to 40° from the rachises, naked basally;

pulvini glabrous;

pedicels 0.5-25 mm, with a narrow band or abscission line below the apices.

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.

5.5-16 mm long, 2.7-9 mm wide, ovate, flattened, greenish to stramineous, sometimes with a reddish-purple tinge, with 4-22 florets;

disarticulation below the glumes, spikelets falling intact.

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.

equal, 3-4.5 mm, ovate, chartaceous;

lemmas 3-5 mm, broadly lanceolate, chartaceous to leathery, lateral veins green, apices acute;

paleas 3-5 mm, chartaceous to hyaline, keels broadly winged below, forming a wing or tooth on each side that often projects beyond the lemma bases, apices acuminate;

anthers 3, 1.4-2.8 mm, golden-yellow.

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

1-2 mm, ellipsoid, adaxial surfaces flattened, reddish-brown.

= 40.

= 40.