Flora of North America species comparison

30-75 cm, erect, glabrous below.

25-75 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.

glabrous or with hairy apices, hairs to 4 mm;

ligules 0.1-0.3 mm, ciliate;

blades 4-8(18) cm long, 1-2 mm wide, involute, frequently deciduous, adaxial surfaces mostly glabrous, sometimes pilose near the base.

(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.

terminal and axillary;

terminal panicles 5-15 cm long, (1)2-10(12) cm wide, narrowly ovate, open;

axillary panicles 2-5 cm long, 0.3-0.6 cm wide, usually contracted and partially to completely enclosed by the subtending sheath;

primary branches 1-10 cm, appressed or diverging up to 90° from the rachises, wiry;

pulvini glabrous or hairy;

pedicels 0.3-5 mm, appressed, flattened.

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.

6-15(27) mm long, 1.6-2.4 mm wide, ovate-lanceolate, plumbeous to greenish, often with a reddish-purple tinge, with 10-35(45) florets;

disarticulation acropetal, glumes first, then the lemmas, 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 to ovate, membranous;

lower glumes 1.4-2.1 mm;

upper glumes 1.6-2.2 mm;

lemmas (1.7)2-2.5 mm, broadly ovate, leathery, apices acute to acuminate;

paleas 1.1-1.7 mm, hyaline, apices obtuse to truncate;

anthers 2, 0.3-0.7 mm, reddish-purple.

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

0.5-0.6 mm, globose, not grooved, smooth, light reddish-brown.

= 40.

= 40.