Flora of North America species comparison

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

30-60 cm, erect or decumbent, occasionally 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.

usually glabrous, occasionally pilose;

ligules membranous, shortly ciliate;

blades 10-30 cm long, to 10 mm wide, sometimes with long basal hairs, usually pilose elsewhere, occasionally glabrous or scabrous.

digitate, with 7-15 evidently distinct branches;

branches 3-8 cm, more or less erect, averaging 14 spikelets per cm.

with 5-15, evidently distinct branches in 1-2(3) whorls;

branches 4.5-8 cm, spikelet-bearing to the base, with 11-15 spikelets per cm distally.

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.

0.7-1.6 mm;

upper glumes 2-2.7 mm;

lowest lemmas 2.8-3.3 mm long, 0.4-0.6 mm wide, lanceolate to elliptic, sides not conspicuously grooved, mostly glabrous, margins shortly ciliate distally, hairs less than 1 mm, apices awned, awns 6-13 mm;

second florets 0.4-0.7 long, about 0.1 mm wide, borne on an equally long or longer rachilla segment, not or inconspicuously bilobed, awned, awns 3-5 mm.

1.1-1.4 mm.

1.4-1.5 mm long, 0.3-0.4 mm wide, ellipsoidal.

= 20, 40, ca. 50.

= 40.