Flora of North America species comparison

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

to 100 cm, erect.

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, scabrous, or partly pilose;

ligules erose to ciliate;

blades with basal hairs to 3 mm, otherwise glabrous, scabrous, or sparsely pilose.

digitate, with 7-15 evidently distinct branches;

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

digitate, with 2-9 evidently distinct branches;

branches 5-11 cm, spikelet-bearing almost to the base, averaging 10 spikelets per cm.

with 1 bisexual and 2(3) sterile florets.

with 1 bisexual and 1(2) staminate floret(s).

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.

1.2-2.3 mm;

upper glumes 2.5-4.1 mm;

lowest lemmas 2-5.4 mm long, 0.6-1.2 mm wide, elliptic to obovate, sometimes ventricose, usually glabrous, midveins scabrous, sides not conspicuously grooved, margins inrolled, usually glabrous or scabrous, occasionally with a few scattered hairs, especially distally, apices entire or minutely bilobed, awned, awns 1-11 mm;

second florets 1-2.6 mm long, 0.3-1 mm wide, cylindrical to narrowly turbinate, apices obtuse to truncate, entire, awned, awns 0.5-7.5 mm;

anthers 0.7-1.4 mm.

1.1-1.4 mm.

1.5-2.1 mm long, about 0.4 mm wide, narrowly obovoid to trigonous.

= 20, 40, ca. 50.

= unknown.