Flora of North America species comparison

30-100 (120) cm.

30-80(90) 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.

dull and fibrous basally, glabrous or sparcely pilose below, hairs to 4 mm, contorted;

ligules 0.1-0.3 mm;

blades 7-31 cm long, 1.2-2.5mm wide, flat to folded, glabrous abaxially, scabridulous adaxially, margins scabrous.

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.

5-22(25) cm long, (0.6)1-11 cm wide, open to somewhat contracted, longer than wide, narrowly pyramidal, not diffuse;

lower nodes with 1-2(3) branches;

primary branches 0.6-8(11) cm, appressed or spreading to 70° from the rachis, not capillary, without spikelets on the lower 1/3, pedicels 0.8-6 mm, appressed, occasionally spreading.

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

3-6 mm, plumbeous.

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, membranous;

lower glumes (1.2)1.8-4.5 mm;

upper glumes 2.4-6 mm, at least 2/3 as long as the florets, occasionally 3-veined;

lemmas (2.7)3-4.3 mm, ovate, membranous, glabrous, acute;

paleas 3.1-4.5 mm, slightly longer than the lemmas, ovate, membranous, glabrous;

anthers 1.7-3 mm, yellowish to purplish.

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

1.4-2.1 mm, pyriform to globose, indurate, without a loose pericarp, smooth, shining, light brown.

= 18, 24, 36.

= 72.