Flora of North America species comparison

20-100 cm, not swollen at the base.

70-200 cm, swollen at the base.

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.

3-12 cm long, 1-2.3 cm wide, ovoid to cylindrical;

branches with groups of 4-7 staminate (rarely sterile) spikelets clustered around a terminal pistillate or bisexual spikelet;

pedicels glabrous or sparsely hispid;

disarticulation below individual bisexual spikelets or below the spikelet clusters.

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

heterogamous, some staminate or sterile, others bisexual or pistillate, with 1-3 florets, if more than 1, lower floret(s) sterile and highly reduced, terminal (or only) floret staminate, pistillate, or bisexual.

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.

usually 5-9 mm long, to 3 mm long on spikelets near the base of the panicle, 1.1-2 mm wide, glabrous or hirsute, keels winged, wings 0.2-0.5 mm wide, entire or irregularly dentate to crenate distally, lateral veins conspicuous, scabrous, apices mucronate, mucros 0.3-0.7(1) mm;

sterile florets, if present, to 1/10 as long the sexual florets, glabrous or almost so;

sexual florets staminate, pistillate or bisexual, 2.5-4.5 mm long, 0.7-1.4 mm wide, glabrous or with a few short hairs at the base;

anthers 2.5-3 mm.

2.8-3.3 mm long, 1.2-1.4 mm wide.

3-5 mm, truncate to acute;

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

4-6 mm, rounded to narrowly acute;

blades 4-20(25) cm long, 1-5(7) mm wide.

= 14.

= 14, 42.