Flora of North America species comparison

30-75 cm, erect, glabrous below.

12-60 cm, erect, glabrous or hairy near the base, often shiny 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.

glabrous, summits shortly pilose, hairs to 0.5 mm;

ligules 0.3-0.5 mm, ciliate;

blades 3-11 cm long, 0.7-2 mm wide, involute or flat, glabrous abaxially, scabridulous 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.

6-11 cm long, 2-4 cm wide, narrowly ovate, loosely contracted;

primary branches 1-3 cm, compact, appressed or diverging to 30° from the rachises, sometimes naked near the base;

pulvini glabrous;

pedicels 0.2-3 mm, diverging, scabridulous.

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.

3-6(15) mm long, 1.3-2 mm wide, linear lanceolate, stramineous, with 9-30 florets;

disarticulation irregular or basipetal, 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.

subequal, 1-1.3 mm, ovate, membranous, apices obtuse to acute;

lemmas 1.4-1.6 mm, ovate, membranous, glabrous, lateral veins conspicuous, green, sometimes obscure towards the apices, apices obtuse;

paleas 1.4-1.6 mm, hyaline, apices truncate, ciliolate;

anthers 3, 0.5-0.8 mm, yellowish.

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

0.4-0.5 mm, oblong-ellipsoid, strongly dorsally compressed, usually with a shallow dorsal groove, smooth to finely striate, mostly light brown, bases often greenish.

= 40.

= unknown.