Flora of North America species comparison

7-35(60) cm, erect or decumbent.

30-100 cm.

rounded below, margins and apices hairy, hairs to 3 mm;

ligules 0.3-1 mm;

blades 2-12(20) cm long, 2-6 mm wide, flat, abaxial surface glabrous, adaxial surface scabridulous, sometimes sparsely hispid, margins ciliate-pectinate.

glabrous, including the apices;

ligules 0.2-0.3 mm;

blades 5-23 cm long, 2-4 mm wide, flat or folded, glabrous on both surfaces, margins glabrous.

4-15(18) cm long, 0.3-6 cm wide, open (contracted when immature), pyramidal;

lower nodes with 7-12(15) branches;

primary branches 0.5-4.5 cm, spreading 30-90° from the rachis, with elongated glands, without spikelets on the lower 1/3 – 1/2, secondary branches appressed;

pedicels 0.1-0.5 mm, appressed.

(8)15-30 cm long, 3.5-8 cm wide, open, diffuse, cylindrical;

lower nodes with 1-2(3) branches;

primary branches 0.6-5 cm, capillary, spreading 30-70° from the rachises, without spikelets on the lower 1/2;

secondary branches spreading;

pedicels 0.5-5 mm.

1.2-1.8 mm, plumbeous or brownish, often secund along the branch.

0.7-1.1 mm, plumbeous to purplish.

unequal, ovate to obovate, membranous;

lower glumes 0.3-0.7 mm, without midveins;

upper glumes 1.2-1.8 mm, at least 2/3 as long as the florets, often longer;

lemmas 1.2-1.7 mm, ovate to elliptic, membranous, glabrous, acute;

paleas 1.1-1.6 mm, ovate to elliptic, membranous, glabrous;

anthers 0.2-0.4 mm, yellowish or purplish.

unequal, obovate to ovate, membranous;

lower glumes 0.1-0.4 mm, occasionally absent;

upper glumes 0.2-0.5 mm;

lemmas 0.7-1.1 mm, elliptic, membranous, glabrous, acute to obtuse;

paleas 0.7-1.1 mm, elliptic, membranous;

anthers 0.2-0.3 mm, yellowish.

0.6-1 mm, obovoid, faintly striate, light brownish.

0.4-0.7 mm, pyriform or quadroid, somewhat laterally flattened, light brownish to whitish.

= 24, 36, 54.

= 12.