Flora of North America species comparison

30-100 (120) cm.

(30)45-120 (180) 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.

shiny and indurate basally, glabrous or appressed hairy elsewhere, hairs to 5 mm, margins hyaline;

ligules 0.2-0.6 mm;

blades 20-50 cm long, 1.2-2(3) mm wide, flat, folded or involute, dark green, remaining so well into winter, glabrous on both surfaces or the adaxial surface sparsely hairy basally, margins 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.

15-30 cm long, 2-6 cm wide, open (contracted when immature), longer than wide, pyramidal to ovate, not diffuse;

lower nodes with 1-2(3) branches;

primary branches 2-8 cm, appressed or spreading to 50° from the rachis, not capillary, without spikelets on the lower 1/3;

secondary branches spreading;

pulvini hairy or glabrous;

pedicels 2-22 mm, longer than the spikelets, spreading, glabrous, scabridulous.

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

3.5-6.5 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.

linear-lanceolate, membranous;

lower glumes 2.4-4.5 mm, 0.6-0.83 times as long as the upper glumes;

upper glumes (3.5)4-6(6.5) mm, as long as or longer than the florets;

lemmas 3.4-4.3 mm, ovate to lanceolate, membranous, glabrous, acute;

paleas 3.4-4.4 mm, ovate, membranous, glabrous;

anthers 2.5-3.4 mm, purplish.

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

1.8-2.2 mm, fusiform, brown.

= 18, 24, 36.

= unknown.