Flora of North America species comparison

30-75 cm, erect, glabrous below.

30-100 cm, erect to geniculate, with narrow, sunken glandular bands.

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

ligules 0.2-0.3 mm;

blades 10-25(40) cm long, 1-5 mm wide, involute, glabrous abaxially, scabridulous adaxially, sometimes also sparsely pilose.

sometimes glandular, apices hairy, hairs to 5 mm;

ligules 0.4-1 mm;

blades 5-21 cm long, 2-6(7) mm wide, flat to involute, with small crateriform glands on the keels and veins, sparsely pilose adaxially.

(3)5-30 cm long, 1-15 cm wide, from narrowly oblong, glomerate, and interrupted below to ovate and open;

primary branches 0.5-12(16) cm, appressed or diverging up to 40° from the rachises, stiff;

pulvini glabrous or sparsely hairy;

pedicels 0-1(3) mm, appressed, flattened.

4-19 cm long, 0.8-7 cm wide, oblong to ovate, glomerate, spikelets clustered in 1-sided groups;

primary branches 0.5-7.5 cm, diverging 10-90° from the rachises, angled, sinuous, glandular;

pulvini hairy, hairs to 2 mm;

pedicels 0.2-2 mm, stout, erect, without a narrow band or abscission line near the apices.

6-16(23) cm long, 2.4-5 mm wide, ovate to linear-elliptic, flattened, stramineous, with reddish-purple margins or completely reddish-purple, with 10-45 florets;

disarticulation basipetal, florets falling intact and before the glumes.

2-5 mm long, 2-3.5 mm wide, broadly ovate, greenish, stramineous to plumbeous, with 7-14 florets;

disarticulation basipetal, glumes persistent.

ovate-lanceolate to lanceolate, membranous;

lower glumes 1.7-3 mm;

upper glumes 2.2-4 mm, apices acuminate;

lemmas 2-6 mm, ovate, membranous to leathery, apices usually acuminate or attenuate, sometimes acute;

paleas 1.5-3 mm, membranous to leathery, narrower than the lemmas, apices obtuse, sometimes bifid;

anthers 2, 0.2-0.5 mm, brownish.

subequal, 1.7-2.2 mm, ovate, membranous, keels with small crateriform glands, apices acute to acuminate;

lemmas 1.8-2.3 mm, broadly ovate to orbicular, chartaceous, keels with small crateriform glands, apices acute to obtuse;

paleas 1.7-2.2 mm, chartaceous, each side with a broad wing at the base, wings often projecting beyond the lemma bases, apices acute;

anthers 3, 0.5-0.9 mm, yellowish.

0.8-1.3 mm, ellipsoid, somewhat laterally flattened, smooth, reddish-brown.

0.8-1.1 mm, ellipsoid, reddish-brown.

= 40.

= 30.