Flora of North America species comparison

30-100 (120) cm.

40-100 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.

keeled or rounded, glabrous, apices ciliate;

ligules 0.2-0.4 mm;

blades 10-40 cm long, 2-4 mm wide, flat but soon becoming involute, tapering to a fine point.

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.

14-35 cm long, 0.4-3 cm wide, contracted, interrupted, and rather lax;

primary branches appressed to strongly ascending, spikelet-bearing to the base, lower branches 1.5-5 cm, much longer than the adjacent internodes;

pedicels 0.1-1.2(1.8) mm.

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

1.4-1.8(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.

0.3-0.5 mm, obtuse;

upper glumes 0.4-0.7 mm, usually less than M as long as the florets, faintly 1-veined, truncate, erose to denticulate;

lemmas 1.4-2 mm, elliptic, glabrous, 1-veined, acute;

paleas 1.4-2 mm, elliptic;

anthers 3(2), 0.9-1.1 mm.

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

0.7-1 mm, quadrangular, laterally compressed, reddish-brown, truncate.

= 18, 24, 36.

= 24.