Flora of North America species comparison

30-100 (120) cm.

35-120 (150) cm, stout.

usually keeled below, glabrous;

ligules 0.2-0.5 mm;

blades (6)10-30(50) cm long, 1-5 mm wide, flat, glabrous on both surfaces.

rounded below, shiny, apices glabrous or sparsely hairy, hairs to 6 mm;

ligules 0.1-0.3 mm;

blades (3)10-45(60) cm long, (1)2-5(6) mm wide, flat to involute, glabrous abaxially, scabridulous adaxially, margins smooth or scabridulous;

flag blades ascending.

20-35(50) cm long, 0.3-2.2(3) cm wide, contracted, narrow, sometimes included in the uppermost sheath;

primary branches 0.4-2.5(5) cm, appressed or spreading to 40° from the rachis, as long or longer than the adjacent internodes;

secondary branches appressed, spikelet-bearing to near the base;

pulvini glabrous;

pedicels 0.1-1.8 mm, appressed.

(10)15-45 cm long, 15-25 cm wide, diffuse, subpyramidal, often included in the uppermost sheath;

primary branches 1.5-13 cm, spreading 30-90° from the rachis;

secondary branches spreading, without spikelets on the lower 1/4 - 1/3;

pulvini glabrous;

pedicels 0.5-2 mm, spreading, glabrous or scabrous.

2-2.6(2.7) mm, plumbeous to light brownish.

1.3-2.8 mm, purplish or greenish.

subequal, ovate or obovate, membranous;

lower glumes 0.5-1 mm, often without midveins;

upper glumes 0.8-1.6 mm, 1/2 - 2/3 as long as the florets, acute to obtuse, entire;

lemmas 1.8-2.6(2.7) mm, ovate, membranous, glabrous, acute or obtuse;

paleas 1.9-2.4 mm, ovate, membranous, glabrous;

anthers 3, 0.5-1.1 mm, white, sometimes purple-tinged.

unequal, lanceolate to ovate, membranous;

lower glumes 0.5-1.8 mm, often without midveins;

upper glumes 1.1-2.4(2.8) mm, at least 2/3 as long as the florets;

lemmas 1.2-2.5 mm, ovate, membranous, glabrous, acute;

paleas 1.1-2.4 mm, ovate, membranous, glabrous;

anthers 1.1-1.8 mm, yellowish to purplish.

1-1.2 mm, quadrangular, laterally compressed, reddish-brown, truncate.

1-1.4 mm, ellipsoid, reddish-brown, striate.

= 18, 24, 36.

= 80, 90, 108, 126.