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 and flattened below, margins occasionally hairy distally, hairs to 1.2 mm;

ligules 0.2-0.4 mm;

blades 12-35 cm long, 4-12 mm wide, flat, glabrous abaxially, scabridulous adaxially, margins smooth or 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.

15-50 cm long, 7-22(30) cm wide, diffuse, ovate;

primary branches 2-17 cm, spreading 40-100° from the rachis;

secondary branches appressed to loosely spreading, without spikelets on the lower 1/4 - 1/2;

pulvini glabrous;

pedicels 0.2-1.2 mm, appressed, scabridulous.

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

1-2 mm, purplish to brownish.

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, narrowly lanceolate to lanceolate, membranous, prominently keeled;

lower glumes 0.6-1 mm;

upper glumes 1.1-1.8 mm, slightly shorter than or subequal to the lemmas;

lemmas 1.2-2 mm, lanceolate, membranous, glabrous, acute;

paleas 1.2-2 mm, ovate, membranous, glabrous, often splitting in two between the veins at maturity;

anthers 0.2-0.4 mm, purplish.

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

0.6-1 mm, ovoid, slightly flattened, reddish-brown.

= 18, 24, 36.

= 40.