Flora of North America species comparison

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

30-45 cm.

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 or sparsely pilose;

ligules membranous, not or only shortly ciliate;

blades to 15 cm long, about 4 mm wide, scabrous.

digitate, with 7-15 evidently distinct branches;

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

with 8-10 clearly separate branches, these usually digitate, occasionally a poorly-developed second whorl present just below the terminal whorl;

branches to 20 cm, divergent, basal 2-5 cm without spikelets, averaging 3-4 spikelets per cm elsewhere.

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.

2.7-3 mm;

upper glumes 3.5-3.8 mm;

lowest lemmas 3.7-4.3 mm long, 0.7-0.8 mm wide, lanceolate to narrowly ovate, sides not conspicuously grooved, margins glabrous or sparsely appressed pubescent distally with hairs shorter than 1 mm, apices acute, awned, awns 7-11 mm;

second florets 2-2.5 mm long, about 0.5 mm wide, narrowly elliptic, acute, inconspicuously bilobed, awns 4.5-6.5 mm.

1.1-1.4 mm.

about 2.3 mm long, about 0.5 mm wide, ellipsoid, trigonous.

= 20, 40, ca. 50.

= unknown.