Flora of North America species comparison

15-95 cm, erect or decumbent and rooting at the lower nodes.

20-75 cm, erect, often branched above.

glabrous;

ligules 0.3-0.5 mm, erose to lacerate;

blades to 15 cm long, 0.3-0.6 mm wide, with basal hairs, otherwise usually glabrous.

glabrous;

ligules membranous, ciliate;

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

digitate, with 7-15 evidently distinct branches;

branches 3-8 cm, more or less erect, averaging 14 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 2(3) sterile florets.

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

1.2-2.1 mm;

upper glumes 2.3-2.7 mm;

lowest lemmas 2-2.7 mm, ovate to elliptic, calluses and distal portion of the margins pilose, hairs to 1 mm, keels glabrous or pilose, apices awned, awns 4-7.7 mm;

second florets 0.9-1.3 mm long, 0.4-0.9 mm wide, slightly to strongly widened distally, inflated, usually glabrous, truncate, awned, awns 5-7 mm;

third florets obovoid to subspherical, smaller than the first, strongly inflated.

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.

1.1-1.4 mm.

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

= 20, 40, ca. 50.

= unknown.