Flora of North America species comparison

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

(30)40-100 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.

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.

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.

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.

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

2.6-3.8 mm, purplish-red.

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, 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.

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

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

= 24, 36, 54.

= unknown.