Flora of North America species comparison

30-100 (120) cm.

10-50(60) cm tall, 0.7-1.2 mm thick.

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, occasionally glabrous, usually villous to tomentose along the margins and back, with soft, kinky hairs to 4 mm;

ligules 0.2-0.4 mm;

blades (0.6)1.5-6(7) cm long, 1-1.5 mm wide, involute, stiff, spreading at right angles to the culm, glabrous abaxially, scabridulous adaxially, margins smooth.

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.

3-10 cm long, (0.3)1-5(6) cm wide, longer than wide, ultimately open, subovate, lower portion often included in the uppermost sheath;

lower nodes with 1-2 branches;

primary branches 0.5-5 cm, appressed or spreading to 90° from the rachis;

secondary branches appressed or spreading, without spikelets on the lower 1/8 – 1/4;

pedicels 0.2-2 mm, appressed or spreading.

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

1.4-2.1 mm, purplish.

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;

upper glumes 1.3-2 mm, from slightly shorter than to subequal to the florets;

lemmas 1.4-2.1 mm, ovate, membranous, glabrous, acute;

paleas 1.4-2.1 mm, ovate, membranous;

anthers 0.7-1 mm, purplish.

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

0.7-1 mm, orangish to whitish.

= 18, 24, 36.

= 40.