Flora of North America species comparison

30-100 (120) cm.

30-120(160) cm.

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 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.

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.

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.

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

1.4-2.2 mm, plumbeous to 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, 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.

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

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

= 18, 24, 36.

= unknown.