Flora of North America species comparison

30-75 cm, erect.

20-75 cm, erect, often branched above.

glabrous;

ligules about 0.5 mm, shortly ciliate;

blades to 20 cm long, to 5 mm wide, sometimes with long basal hairs, otherwise scabrous.

glabrous;

ligules membranous, ciliate;

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

with 5-17, evidently distinct branches in 1-3 closely-spaced whorls;

branches to 7 cm, usually erect when young, spreading to reflexed at maturity, averaging 12 spikelets per cm.

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 staminate floret.

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

1.5-3.2 mm;

upper glumes 2.5-3.4 mm;

lowest lemmas 2.8-3.7 mm long, 0.6-1.1 mm wide, broadly linear to elliptic, mostly glabrous but the margins appressed pubescent, apices obtuse, not conspicuously bilobed, sometimes shortly mucronate;

second florets 1.4-2.2 mm long, 0.3-0.9 mm wide, usually at least twice as long as wide, not lobed, unawned, occasionally mucronate.

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.

1.7-2.3 mm long, 0.5-0.6 mm wide, ellipsoid.

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

= ca. 65, 80.

= unknown.