40 Class III. Order III. 



44. PANICUM. 



Subgenus SETARIA. Flowers mostly spiked ; spikelets fur- 

 nished with a bristly involucre, 



PANICUM GLAUCUM. L. Glaucous Panic grass. 



Spike oblong ; involucre of many bristles, rough 

 forward ; corolla of the fruit transversely wrinkled. 



Syn. SET ASIA GLAUCA. R. $ S. 



PENNISETUM GLAUCUM. Nult. 



Culm round, striated, grooved at top. Leaves linear-lanceo- 

 late, flat, with striated sheaths and hairy stipules. Spike cylin- 

 drical, its pedicels mostly two flowered with involucres of ten or 

 a dozen yellowish hristles which are rough upward. Corolla 

 inclosing the seed corrugated. Cultivated and low grounds. 

 July. Annual. 



PANICUM VERTICILLA.TUM. L. Whorled Panic grass. 



Spike whorled ; spikelets in fours ; involucres of 

 two bristles, rough backward, single flowered. 



Syn. SETARIA VERTICILLATA. R. fy S. 



PENNISETUM VERTICILLATUM. JVutt. 



Culr spreading, rough near the spike. Leaves broad, rough 

 forward ; stipules hairy. Spike single, rather cylindrical, com- 

 posed of crowded spikelets arranged in whorls. The spike feels 

 rough when drawn downward, being in this respect the reverse 

 of the former species, the bristles of which are differently beard- 

 ed. Cultivated grounds. July, August. Annual. 



Subgenus ECHINOCHLOA. Flowers in a compound cluster- 

 ed panicle ; lower valve of the barren floret awned or acumi- 

 nate. 



PANICUM CRUS GALLI. L. Cocksfoot Panic grass. 



Racemes compound, alternate and in pairs ; their 

 stalk five angled ; glumes terminating in hispid 

 bristles. 



Syn. ECHINOCHLOA csus GALLI. R. 4' S. 



A large annual grass, two or three feet high, with broad flat 



