Flora of North America species comparison

15-60 cm, erect.

20-75 cm, erect, often branched above.

glabrous;

ligules 0.7-1 mm;

blades to 20 cm long, 2-4 mm wide, without basal hairs, glabrous or scabrous, upper cauline leaves often greatly reduced.

glabrous;

ligules membranous, ciliate;

blades to 15 cm long, 2-5 mm wide, sometimes with basal hairs, otherwise glabrous or scabrous.

with 10-20 branches in several closely-spaced whorls;

branches 2-5 cm, spreading, with 14-18 spikelets per cm;

disarticulation beneath the glumes.

digitate, with 4-13 easily separable or evidently distinct branches;

branches 5-11 cm, initially erect, becoming divaricate, with 10-14 spikelets per cm.

with 1 bisexual and 1 sterile floret.

pectinate, diverging at a wide angle from the branch axes, with 1 bisexual and 1 staminate floret.

0.5-0.7 mm;

upper glumes 1-1.5 mm;

lowest lemmas 1.5-2 mm long, 0.7-1 mm wide, broadly elliptic, mostly glabrous but the keels and marginal veins appressed-pilose, obtuse, awned, awns 0.3-1.5 mm;

second florets 1-1.5 mm long and about equally wide, conspicuously inflated, spherical, with the distal portion of the margins inrolled, not or inconspicuously bilobed, lobes less than 1/5 as long as the lemmas, midveins sometimes excurrent to 1.5 mm.

1.4-2.5 mm;

upper glumes 2.9-4.3 mm;

lowest lemmas 3-6.2 mm long, 0.4-0.6 mm wide, linear to narrowly lanceolate, margins glabrous, scabrous, or with hairs less than 0.2 mm, lemma apices bilobed, lobes 0.5-1 mm, sometimes awned, central awns 4-37 mm, awns of lateral lobes, if present, less than 0.6 mm;

second florets 1.7-2.9 mm long, 0.2-0.3 mm wide, laterally compressed, bilobed, lobes 1/3–1/2 as long as the lemmas, awned, awns 4-10 mm.

0.9-1.2 mm long, about 0.5 mm wide, obovoid.

about 2.3 mm long, about 0.3 mm wide, narrowly ellipsoid, trigonous.

= 40.

= unknown.