Flora of North America species comparison

30-100 (120) cm.

20-100 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.

rounded below, distal margins and apices hairy, hairs to 3 mm;

ligules 0.2-1.2 mm;

blades 5-20 cm long, 3-8 mm wide, flat to loosely involute, glabrous abaxially, scabridulous adaxially, margins scabridulous.

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.

10-25(35) cm long, 1-5 cm wide, usually some-what contracted, sometimes spikelike, often interrupted below;

primary branches 0.7-7 cm, appressed or spreading to 30° from the rachis, spikelet-bearing to the base;

secondary branches appressed;

pedicels 0.2-1.4 mm, appressed.

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

1.6-2 mm, yellowish-green to grayish.

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 0.5-1.1 mm, usually without veins;

upper glumes 1.1-2 mm, subequal to the lemmas;

lemmas 1.1-2 mm, ovate, membranous, glabrous (occasionally minutely pubescent), acute;

paleas 1-2 mm, ovate, membranous;

anthers 2 or 3, 0.5-1 mm, yellowish or purplish.

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

0.7-1.1 mm, ellipsoid, laterally flattened, light brownish.

= 18, 24, 36.

= unknown.