92 cabombacEjE. 



is also explicitly mentioned by Salisbury, in 1806,* and by Nuttall, in 

 1818. 



The last-named author has also well described the circularly disposed air- 

 tubes, &c, of the stalks of Brasenia ; which, however, are constructed near- 

 ly as in the stems of most aquatics ; except that they are said by Schleiden 

 and Lindley to be entirely destitute of spiral vessels. 



The two genera of which the group consists are both represented in the 

 United States, to which and to Eastern New Holland ! Brasenia is confined ; 

 while Cabomba is divided between the Southeastern United States and the 

 eastern side of South America near the equator. 



The roots and herbage of these plants are mucilaginous, with some as- 

 tringency. They are entirely destitute of acridity and of any noxious 

 qualities. 



* In Konig and Sims, Annals of Botany, ~. p. 74. 



