Flora of North America species comparison

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

14-40 cm, erect or decumbent, sometimes rooting at the lower nodes.

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.

mostly glabrous, with hairs to 3 mm adjacent to the ligule;

ligules 0.7-1.3 mm, shortly ciliate;

blades to 15 cm long, 2-3 mm wide, 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.

with 10-16, evidently distinct branches in several well-separate whorls, and a solitary, vertical terminal branch;

branches 5-15 cm, spikelet-bearing to the base, with 4-7 spikelets per cm;

disarticulation at the uppermost cauline node, panicles falling intact.

with 1 bisexual and 2(3) sterile florets.

with 1 bisexual and 1 sterile 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.

2-3 mm;

upper glumes 2.8-3.5 mm;

lowest lemmas 2-3.5 mm long, 1.5-1.9 mm wide, elliptic to lanceolate, keels glabrous or appressed pubescent, sides not conspicuously grooved, margins glabrous or appressed pubescent, acute to obtuse, awned, awns 4.8-9 mm;

second florets 1.1-2.3 mm, oblong, somewhat inflated, truncate, not or inconspicuously bilobed, lobes less than 1/5 as long as the lemmas, midveins excurrent, forming 3.2-7 mm awns.

1.1-1.4 mm.

1.3-1.5 mm long, about 0.5 mm wide, elliptic.

= 20, 40, ca. 50.

= ca. 28, 40, 63.