68 PL- ANT AE AMERICAN A E, 



Radix fibrofa, annua. 



Caulis tetragonus, glaber, bi-vel tripedalis ^ 

 ramis alternis, fuperne interdum dichoto- 

 mis. 



Folia lanceolata,. utrinque acuta, glabra ve- 

 nis longitudinalibus, bafi jun&a membrana. 



f lores fefliles, verticillati, purpurafcentes-albi* 

 minutirTimi. 



Has tres fpecies congeneres legi, quarum 

 character hie eft : 



Cal. Perianthium tetraphyllum, laxum, ger- 

 men coronans : foliolis linearibus, acutis^ 

 brevibus ; perfiftens. 



Cor. tubulato-campanulata, calyce longior. 

 Tubo furfum latere intus pilofo : ore quadri- 

 dentato : dentibus ovatis, patulis. 

 AM. Filamenta quatuor, corollae mox intra 

 divifuras impofita, capillaria, corolla hrc- 

 viora. Anther ae lineares. 



Pist. Germen Tub receptaculo calyce corona- 

 turn, fubrotundum. Stylus filiformis. Stig- 

 ma globoio-capitatum, linea bifidum. 



Per. Cortex feminum coronatus calyce, yel 

 nullum. 



Sem. duo, ovata, hinc convexa, inde plana. 



5. HOUSTONIA floribus verticillatis 

 feflilibus. 



Radix 



