Flora of North America species comparison

30-75 cm, erect, glabrous below.

(30)45-100 cm, erect, glabrous below the nodes.

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.

rarely glabrous, apices and distal margins usually hairy, sometimes also densely hairy basally, dorsally, and on the collars, hairs to 6 mm, papillose-based;

ligules 0.2-0.4 mm;

blades 25-60 cm long, 3-8(11) mm wide, flat to loosely involute, usually glabrous, adaxial surfaces sometimes hairy basally.

(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.

25-85 cm long, 15-40 cm wide, broadly ovate, open;

primary branches mostly 4-35(45) cm, diverging 20-90° from the rachises, capillary;

pulvini glabrous or hairy;

pedicels 2-28 mm, divergent.

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.

2-4(5) mm long, 1-1.7 mm wide, lanceolate, greenish with purplish tinges, with 2-6 florets;

disarticulation acropetal, paleas 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.

lanceolate, hyaline to membranous;

lower glumes 1.1-2 mm;

upper glumes 1.5-2.8 mm, apices acuminate to acute;

lemmas 1.6-2.4 mm, ovate, membranous, hyaline near the margins, lateral veins inconspicuous, apices acute;

paleas 1.2-2.2 mm, hyaline, bases not projecting beyond the lemmas, apices acute to obtuse;

anthers 3, 0.3-0.8 mm, purplish.

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

0.8-1 mm, rectangular-prismatic, somewhat laterally compressed, with or without a well-developed adaxial groove, striate, opaque, reddish-brown.

= 40.

= 100.