Flora of North America species comparison

30-100 (120) cm.

(30)40-100 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 below, margins and apices sometimes sparsely ciliate;

ligules 0.1-0.2 mm;

blades (6)10-30 cm long, 0.8-2 mm wide, flat to tightly involute, glabrous abaxially, scabridulous adaxially, margins scabrous, apices pungent.

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.

7-28 cm long, 2-6 cm wide, open, pyramidal;

lower nodes with 3 or more branches;

primary branches 0.7-4.5 cm, spreading 20-100° from the rachis, whorled or verticellate, without spikelets on the lower 1/8–1/2;

secondary branches appressed;

pedicels 0.4-2.5 mm, appressed, scabridulous.

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

2.6-3.8 mm, purplish-red.

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 lanceolate or ovate, hyaline to membranous;

lower glumes 0.9-3 mm;

upper glumes 2.6-3.8 mm, as long as or longer than the florets;

lemmas 2-3.6 mm, ovate, membranous, glabrous, acute;

paleas 2-3.6 mm, ovate, membranous;

anthers 1.4-2 mm, purplish.

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

1.4-1.8 mm, ellipsoid, somewhat laterally flattened, somewhat rugulose, reddish-brown.

= 18, 24, 36.

= unknown.