Flora of North America species comparison

30-75 cm, erect, glabrous below.

65-100 cm, erect, glabrous.

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.

flattened, smooth, shiny, glabrous or puberulent;

ligules 0.2-0.4 mm;

blades 15-50(70) cm long, 2-4 mm wide, folded, margins involute or revolute, abaxial surfaces glabrous or sparsely hairy, adaxial surfaces scabridulous.

(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.

13-28 cm long, 2-8 cm wide, narrowly oblong to narrowly lanceolate, contracted to open;

primary branches 1-8 cm, appressed or diverging up to 30° from the rachises;

pulvini glabrous or hairy;

pedicels 1-7 mm, appressed, glabrous.

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.

6-14 mm long, 1.3-2.5 mm wide, linear-oblong, greenish to plumbeous, with 9-14 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.

narrowly ovate to lanceolate, membranous to hyaline;

lower glumes 0.4-1.2 mm, scalelike;

upper glumes 1-1.5 mm;

lemmas 1.8-3 mm, ovate, membranous, strongly keeled, keels with minute punctate glands, lateral veins conspicuous, apices acute to obtuse;

paleas 1.8-3 mm, hyaline to membranous, bases not projecting beyond the lemmas, apices obtuse to truncate;

anthers 3, 1.2-1.8 mm, reddish-purple.

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

1-1.6 mm, rectangular-prismatic to ovoid, laterally compressed, adaxial surfaces deeply grooved, smooth, opaque, reddish-brown.

= 40.

= 20.