Flora of North America species comparison

7-35(60) cm, erect or decumbent.

35-120 (150) cm, stout.

rounded below, margins and apices hairy, hairs to 3 mm;

ligules 0.3-1 mm;

blades 2-12(20) cm long, 2-6 mm wide, flat, abaxial surface glabrous, adaxial surface scabridulous, sometimes sparsely hispid, margins ciliate-pectinate.

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.

4-15(18) cm long, 0.3-6 cm wide, open (contracted when immature), pyramidal;

lower nodes with 7-12(15) branches;

primary branches 0.5-4.5 cm, spreading 30-90° from the rachis, with elongated glands, without spikelets on the lower 1/3 – 1/2, secondary branches appressed;

pedicels 0.1-0.5 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.

1.2-1.8 mm, plumbeous or brownish, often secund along the branch.

1.3-2.8 mm, purplish or greenish.

unequal, ovate to obovate, membranous;

lower glumes 0.3-0.7 mm, without midveins;

upper glumes 1.2-1.8 mm, at least 2/3 as long as the florets, often longer;

lemmas 1.2-1.7 mm, ovate to elliptic, membranous, glabrous, acute;

paleas 1.1-1.6 mm, ovate to elliptic, membranous, glabrous;

anthers 0.2-0.4 mm, yellowish or purplish.

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.

0.6-1 mm, obovoid, faintly striate, light brownish.

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

= 24, 36, 54.

= 80, 90, 108, 126.