Flora of North America species comparison

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

(40)100-200(250) cm.

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.

shiny and indurate basally, glabrous or appressed hairy elsewhere, hairs to 5 mm;

ligules 0.2-0.7 mm;

blades (10)25-50 cm long, (2)3-10 mm wide, flat to folded, pale bluish-green, yellowing at maturity, glabrous on both surfaces or the adaxial surface sparsely hairy basally, margins scabridulous.

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.

(18)30-50 cm long, 4-15 cm wide, open (contracted when immature), longer than wide, not diffuse, pyramidal to ovate;

lower nodes with 1-2(3) branches;

primary branches 4-15 cm, spreading 10-90° from the rachis, not capillary, without spikelets on the lower 1/3;

secondary branches spreading;

pulvini hairy or glabrous;

pedicels 2-14 mm, longer than the spikelets, spreading, glabrous, sometimes scabridulous.

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

(3.7)4-6 mm, purplish-brown.

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.

linear-lanceolate, membranous;

lower glumes 2.5-5.1 mm, (0.6)0.75-0.9(0.94) times as long as the upper glumes;

upper glumes 3.7-5.7 mm, longer than the florets;

lemmas 3-4 mm, ovate to lanceolate, membranous, glabrous, acute;

paleas 3-4 mm, ovate, membranous, glabrous;

anthers 2-3.1 mm, purplish.

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

1.7-2 mm, fusiform, reddish-brown.

= 24, 36, 54.

= unknown.