124 VASCULAR PLANTS. 



0. prostrate, diffusely dichotonious ; leaves 

 opposite. 



ORDER XXXI. PIPERALES. 



Flowers sessile, in dense spikes or racemes, 

 bracteate, without perigonium. Stem articu- 

 late. 



Family XCI. Saururae. 



Ovary central, compound of several follicular 

 carpidia; stigmas several. 



l. Anemopsis, Nutt. 



Flowers in a dense, conical spadix; with a 

 several-leaved, persistent, colored involucre; 

 each flower subtended by a colored bract. Sta- 

 mens adnate to the base of the ovary. Ovary 

 immersed into the rhachis, 1-locular, with par- 

 ietal placentas. Fruit a capsule dehiscent from 

 the apex. 



% . leaves mostly radical. 



Family XCII. Ceratophyllese. {Of doubtful affinity ) 



Monoecious. Involucre 12-cleft; lobes linear, 

 truncate. $ flowers : anthers co , sessile. ? 

 flowers: ovary 1-locular, 1-ovulate; style termi- 

 nal. Fruit a nutlet, with persistent style and 

 involucre. 



H . submersed aquatics ; stems articulate ; 

 leaves verticillate, sessile, dichotonious. 



