Flora of North America species comparison

30-100 (120) cm.

25-60 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.

dull and fibrous basally, with scattered, contorted hairs to 5 mm, margins glabrous;

ligules 0.2-0.7 mm;

blades (5)8-20 cm long, 1-2.5 mm wide, flat to folded, glabrous or scattered-pilose on both surfaces, margins glabrous.

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.

5-20 cm long, (0.6)1-8 cm wide, longer than wide, narrowly pyramidal, open to somewhat contracted, not diffuse, well-exerted from the upper leaf sheath;

lower nodes with 1-2(3) branches;

primary branches 0.6-7 cm, appressed or spreading to 70° from the rachis, not capillary, without spikelets on the lower 1/3;

pedicels 0.8-5.5 mm, appressed to spreading.

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

4.5-6.6 mm, plumbeous.

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, lanceolate, membranous;

lower glumes (2)2.5-4.2 mm;

upper glumes 3.8-6.5 mm, at least 2/3 as long as the florets;

lemmas 5-6.5 mm, ovate, membranous, glabrous, acute;

paleas 4.8-6.5 mm, ovate, membranous;

anthers 3-4.2 mm, yellow to purplish.

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

about 3 mm long, 1.5-1.7 mm thick, pyriform-globose;

embryo dark brown to blackish;

endosperm reddish-brown.

= 18, 24, 36.

= 30.