1915] 



BRITTON VEGETATION OF MOM ISLAND 45 



PARITIUM TILIACEUM (L.) Juss. 



Border of a swamp, Sardinera: Porto Rico; Hispaniola; Bahamas. 



GOSSYPIUM BARBADENSE L. 



Spontaneous after cultivation on the coastal plain. Apparently not native. 



MELOCHIA TOMENTOSA L. 



Common on the coastal plain and on the plateau: Porto Rico; Hispaniola; 

 Bahamas ; Curacao. 



WALTHERIA AMERICANA L. 



Occasional on the coastal plain and on the plateau: Porto Rico; Hispaniola; 

 Bahamas; Curacao. 



AYENIA PUSILLA L. 



Frequent on the coastal plain: Porto Rico; Hispaniola; Bahamas. 



HELICTERES JAMAICENSIS Jacq. 



Frequent on the coastal plain and on the plateau: Porto Rico; Hispaniola; 

 Bahamas. 



CLUSIA ROSEA Jacq. 



Common on the coastal plain and on the plateau: Porto Rico; Hispaniola; 

 Bahamas. 



CANELLA WINTERANA (L.) Gaertn. 



Common on the coastal plain and on the plateau: Porto Rico; Hispaniola; 

 Bahamas. 



TURNERA DIFFUSA Willd. 



Occasional on the coastal plain and on the plateau: Porto Rico; Hispaniola; 

 Bahamas. 



PASSIFLORA SUBEROSA L. 



Common on the coastal plain and on the plateau: Porto Rico; Hispaniola; 

 Bahamas; Curacao. 



PASSIFLORA FOETIDA L. 



Sandy beach, Playa de Fajaro: Porto Rico; Hispaniola; Bahamas; Curacao. 



CARICA PAPAYA L. 



Common on the coastal plain about Sardinera, apparently established after 

 cultivation. A race with small globose fruits. Original home unknown. 



HARRISIA PORTORICENSIS Britton 



Common on the talus and on the plateau: Porto Rico. 



CEPHALOCEREUS ROYENI (L.) Britton & Rose 



Common on the plateau: Porto Rico [St. Thomas to Antigua]. 



CACTUS INTORTUS Mill. (Melocactus portoricensis Suringar.) 

 Common on the plateau: Porto Rico [St. Thomas to Antigua]. 



CORYPHANTHA NIVOSA (Link) Britton. (Mamillaria nivosa Link.) 



Very abundant on the plateau: Culebra [St. Thomas to Tortola; Antigua]; 

 Bahamas. 



OPUNTIA CATACANTHA Link & Otto 



Common on the plateau; occasional on the coastal plain: Porto Rico [St. 

 Thomas to Antigua] . 



OPUNTfA TAYLORI Britton 



Top of cliff near Sardinera: Santo Domingo; Culebra [St. Thomas to 

 Tortola]. 



OPUNTIA DILLENII (Ker.) Haw. 



Common on the coastal plain and on the plateau. Not collected: Porto 

 Rico; Hispaniola; Bahamas. 



