of the Galapagos Archipelago. 193 



the stems and branches (circumstances perhaps attributable to age), the sca- 

 rious nature of the bracteas, and a more intimate cohesion between the seg- 

 ments of the perianth than I can well imagine to exist in the former, together 

 with the development of broad wings in that organ. May they not be two 

 sexes of a dioecious plant ? . 



96. Cryptocarpus pyriformis, H. B. K. 



Hab. Chatham Island, Charles Darwin, Esq. It is also found on the continent of South 

 America. 



In these specimens the filaments are united into the base, and placed on 

 one side of the ovary, which is oblique, with a penicillate stigma, arising from 

 the side opposite the phalanx of stamens. 



PHYTOLACCEiE. 



97- Phytolacca decandra, L. 



Hab. James Island, Charles Darudn, Esq. An abundant South American plant. 



98. BOUSSINGAULTIA BASELLOIDES, H. B. K. 



Hab. Charles Island, Charles Darwin, Esq. Also a widely-diffused American plant. 



Nyctagine^. 



99. Boerhaavia hirsuta, L. 

 Hab. Albemarle Island, Mr. Macrae. 



100. B. decumbens, L. ? 



Hab. James Island, Charles Darwin, Esq. 



Specimens very imperfect. 



101. B. erecta, L. 



Hab. Albemarle Island, Mr. Macrae. 



102. B. SCANDENS, L. 



Hab. James and Charles Islands, CAar/es Darwin, Esq. This and the three former are 

 all common tropical plants. 



103. PisoNiA FLORiBUNDA, Hook.JiL; arborca, ramis nudis teretibus, foliis 

 sparsis petiolatis ovato-oblongis obtusis integerrimis utrinque sed subtiis 



