Flora of North America species comparison

20-100 cm, not swollen at the base.

30-100 cm.

3-9 cm long, about 2 cm wide, dense, obovoid to clavate, tapering at the base, rounded to truncate at the top;

branches with groups of 5-6 usually staminate, rarely sterile spikelets clustered around a terminal pistillate or bisexual spikelet;

pedicels hispid;

disarticulation beneath the spikelet clusters.

1.5-5 cm long, 1.5-2 cm wide, ovoid to oblong-ovoid, continuous, not lobed, truncate at the base;

branches not evident, spikelets borne singly, not clustered.

heterogamous, with 3 florets, lower 2 florets sterile and highly reduced, terminal floret usually staminate, pistillate, or bisexual, rarely sterile.

homogamous, with 3 florets, terminal floret bisexual;

disarticulation above the glumes, beneath the sterile florets.

of staminate or sterile spikelets varying, those at the base of the panicle reduced to knobs of tissue terminating the pedicels, those higher up often clavate, those near the top of the panicle similar to the glumes of the sexual spikelets but somewhat narrower;

glumes of pistillate or bisexual spikelets 4-8 mm long, about 1 mm wide, keeled, keels winged, wings 0.2-0.4 mm wide, terminating below the apices and forming a single, prominent tooth, lateral veins conspicuous, apices acuminate to awned, awns about 0.5 mm;

sterile florets of all spikelets 0.2-0.4 mm, knoblike projections on the calluses of the terminal florets often with 1-2 hairs;

terminal florets of all spikelets 2.5-3.5 mm long, 0.8-1.5 mm wide, indurate, shiny, glabrous or with a few short hairs near the tip;

anthers 1.5-2.5 mm.

7-10 mm long, 2-2.5 mm wide, smooth, mostly glabrous, sometimes sparsely pilose between the veins, keels winged, wings to 0.6 mm, widening distally, lateral veins inconspicuous, smooth, apices rounded to acute, sometimes mucronate;

sterile florets 2, equal or subequal, 2-4.5 mm, 1/3 or more the length of the bisexual florets, lanceolate, sparsely hairy, acute;

bisexual florets 4.5-6.8 mm, ovate, densely hairy, shiny, stramineous to gray-brown;

anthers 2-4 mm.

3-5 mm, truncate to acute;

blades 5-10(15) cm long, 2-5 mm wide.

3-6 mm, rounded to obtuse, lacerate;

blades 3-25 cm long, 2-10 mm wide.

= 14.

= 12.