Flora of North America species comparison

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

30-120(160) 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.

rounded and papery below;

ligules 0.1-0.3 mm;

blades 10-30 cm long, 2-4(5) mm wide, not obviously distichous, flat, becoming folded, pilose abaxially, tapering to the slender apices.

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.

15-50 cm long, 2.4-8 cm wide, somewhat contracted to rather lax and open;

primary branches appressed or ascending, spreading to 60°from the rachis;

spikelet-bearing to the base or without spikelets on the lower 1/4, lower branches mostly 2-9 cm, longer than the internodes;

pedicels 0.7-3 mm.

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

1.4-2.2 mm, plumbeous to 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, linear-lanceolate to ovate, membranous;

lower glumes (0.4)0.6-1.2(1.5) mm, without midveins, acuminate;

upper glumes (0.9)1.4-2 mm, 2/3 to as long as the spikelet, faintly 1-veined, acute;

lemmas (1.4)1.8-2.2 mm, narrowly ovate, glabrous, 1-veined, acute;

paleas (1.2)1.6-2 mm, ovate;

anthers 3, 09-1.2 mm.

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

0.6-1 mm, quadrangular, laterally compressed, whitish-brown, truncate.

= 24, 36, 54.

= unknown.