Flora of North America species comparison

30-100 (120) cm.

(20)35-80(100) cm, wiry.

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.

shiny and indurate basally, glabrous or appressed hairy elsewhere, hairs to 4 mm;

ligules 0.2-0.4 mm;

blades (10)25-54 cm long, 0.5-1.2 mm wide, terete or subterete at least basally, sometimes channeled for portions of their length, green to yellowish-green, senescing or turning tan in late fall, glabrous on both surfaces or the adaxial surface sparsely hairy basally, 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.

10-26 cm long, 1-9 cm wide, open (contracted when immature), not diffuse, narrowly pyramidal to ovate;

lower nodes with 1-2(3) branches;

primary branches 1-8 cm, ascending or spreading to 40° from the rachis, not capillary, without spikelets on the lower 1/3;

secondary branches spreading;

pulvini hairy;

pedicels 3-18 mm, longer than the spikelets, spreading, with scattered ascending hairs.

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

4-5.6 mm, purplish-brown.

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, membranous;

lower glumes 2-3.8 mm, 0.5-0.8 times as long as the upper glumes;

upper glumes 4-5.6 mm, usually longer than the florets;

lemmas 3.4-4.4 mm, ovate, membranous, glabrous, acute;

paleas 3.3-4.4 mm, ovate, membranous, glabrous;

anthers 1.5-2.6 mm, purplish.

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

not seen.

= 18, 24, 36.

= unknown.