RUTALES.] 



ELATINACE^. 



481 



I observe that Dr. Bunge considers Ehreuberg's genus Anatropa identical with Tetra- 

 dichs. M. Decaisne long since pointed out to me the close relation between the two, 

 and at the same time expressed his opinion that the former would constitute a new 

 Order between Rueworts and Beancapers. But since Anatropa has stipules, according 

 to Elu'enberg, it seems premature to combine them. 



Elatine, Linn. 

 Crypta, Nutt. 

 Cryptlna, Raf. 

 Hydropiper, Endl. 



GENERA. 



Birolia, Bellard. jBergia, Linn. 



Alsinastrnm, Endl. Lancretia, Del. 



PotamopitySfViMxh. Merimea, Camb, 



Numbers. Gen. 6. Sp. 22. 



Tetradiclis, Stev. 

 Anatropa, Ehrenh. 

 ? Tridia, Korth. 



Position. — Zygophyllacese. — Elatinace^. — Podostemacese, 

 Hypericaceee. 



