Flora of North America species comparison

30-100 (120) cm.

90-250 cm, stout.

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 below, shiny, glabrous, rarely sparsely hairy apically, hairs to 6 mm;

ligules 1-2 mm;

blades 20-70 cm long, 3-10 mm wide, flat (rarely involute), glabrous abaxially, scabrous adaxially, margins scabrous;

flag blades ascending.

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.

20-60 cm long, 12-26 cm wide, open, broadly lanceolate, exserted;

primary branches 1.5-10 cm, spreading 20-70° from the rachis;

secondary branches appressed, spikelet-bearing to the base;

pulvini glabrous;

pedicels 0.2-0.5 mm, mostly appressed.

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

1.5-2.5 mm, crowded, purplish or 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, lanceolate to ovate, membranous;

lower glumes 0.5-1 mm, often appearing veinless;

upper glumes 0.8-2 mm, 2/3 or more as long as the florets;

lemmas 1.2-2.5 mm, ovate, membranous, glabrous, acute to obtuse;

paleas 1.1-2.5 mm, ovate, membranous, glabrous;

anthers 1.1-1.3 mm, yellowish to purplish.

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

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

= 18, 24, 36.

= 36.