1915] 



BRITTON VEGETATION OF MONA ISLAND 47 



JACQUEMONTIA JAMAICENSIS (Jacq.) Hall. f. 



Occasional on coastal sands: Porto Rico; Hispaniola; Bahamas. 



JACQUEMONTIA PENTANTHA (Jacq.) D. Don 



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

 Bahamas; Curacao. 



OPERCULINA AEGYPTIA (L.) House 



Cultivated ground, coastal plain: Porto Rico; Hispaniola; Curacao. 



? EXOGONIUM MICRO DACTYLUM (Griseb.) House 



Occasional on the plateau. Specimen insufficient for certain determination. 



IPOMOEA PES-CAPRAE (L.) Roth. 



Common on coastal sands: Porto Rico; Hispaniola; Bahamas; Curacao. 



IPOMOEA TRILOBA L. 



Frequent in cultivated ground on the coastal plain: Porto Rico; Bahamas. 



CALONYCTION GRANDIFLORUM (Jacq.) Choisy. (Ipomoea tuba G. Don.) 

 Frequent in coastal thickets: Porto Rico; Hispaniola; Bahamas; Curacao. 



VARRONIA GLOBOSA Jacq. 



Occasional on the coastal plain: Porto Rico; Hispaniola; Bahamas; Curacao. 



BOURRERIA SUCCULENTA Jacq. 



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



Curacao. 



MALLOTONIA GNAPHALODES (L.) Britton.i (Tournefortia gnapha- 



lodes R. Br.) 



Common on coastal sands: Porto Rico; Hispaniola; Bahamas; Curacao. 



TOURNEFORTIA HIRSUTISSIMA L. 



Base of limestone cliffs, Sardinera: Porto Rico; Hispaniola. 



TOURNEFORTIA MICROPHYLLA Bert. 



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



HELIOTROPIUM CRISPIFLORUM Urban 



Moist soil, coastal plain: Porto Rico. Closely resembles the Porto Rico 

 plant but is lower and with shorter internodes; no ilowering specimens were 

 obtained. 



HELIOTROPIUM PARVIFLORUM L. 



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



LANTANA SCABR1DA Ait. 



Collected by Professor Stevens, not found by us: Porto Rico; Hispaniola. 

 Apparently specifically distinct from L. Camara L. 



LANTANA INVOLUCRATA L. 



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



Bahamas ; Curacao. 



VALERIANODES JAMAICENSIS (L.) Medic 



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

 Bahamas; Curacao. 



VALERIANODES STRIGOSA (Vahl) Kuntze 



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



iMallotonia (Griseb.) Britton, gen. nov. 



Tournefortia Section Mallotonia Griseb. Fl. Brit. W. I. 483. 1861. 



Type species: Tournefortia gnaphalodes (L.) R. Br. 



