Flora of North America species comparison

30-100 (120) cm.

6.5-100 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, margins ciliate, apices with tufts of hairs to 2 mm;

ligules about 0.5 mm, the sides with a few hairs to 1.5 mm;

blades 7-30 cm long, 1-2(3) mm wide, flat, becoming involute, tapering to a fine point.

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.

20-40 cm long, 0.4-1 cm wide, narrowly contracted, sometimes spikelike;

primary branches appressed to strongly ascending, spikelet-bearing to the base, lower branches 1.5-3 cm, much shorter than the adjacent internodes, usually appressed;

pedicels 0.1-0.5 mm.

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

1.1-1.5 mm, dark green.

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.

obtuse, often erose;

lower glumes 0.4-0.5 mm;

upper glumes 0.5-0.6 mm, less than 2/3 as long as the florets;

lemmas 1.1-1.5 mm, glabrous, 1-veined, obtuse;

paleas similar to the lemmas or slightly longer;

anthers 2, 0.4-0.6 mm.

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

0.7-0.8 mm, often adhering to the floret at maturity, quadrangular to somewhat turbinate, red-brown, apices truncate and concave.

= 18, 24, 36.

= unknown.