JOHNSTON: FLORA OF MARGARITA ISLAND. 293 



OCHNACEAE. 



GoMPHiA PYRiFOLiA Griscb., Fl. Brit. W. Ind., p. 105 (1859).— No. 

 20. A tree, about 3 m. high. 



TURNERACEAE. 

 TuRNERA DIFFUSA Willd. — No. 21. On Margarita also. 

 CACTACEAE. 



Cereus margaritensis Johnston. — • On Margarita also. 



C. EBURNEUS Salm-Dyck. — On Margarita also. 



Melocactus communis Link & Otto. — No. 22. On Margarita. 



Opuntia Tuna Mill. — • On Margarita also. 



Pereskia opuntiaeflora DC. — On Margarita also. 



RHIZOPHORACEAE. 



Rhizophora Mangle L. — On Margarita also. 



MYRSINACEAE. 



Jacquinia Berterii Spreng., Syst., vol. 1, p. 668 (1825) — Further 

 distribution, San Domingo. A tree, about 3 m. high. 



# 



SAPOTACEAE, 



BuMELiA CUNEATA Sw. — On Margarita also. 



SOLANACEAE. 



Lycium salsum Ruiz. & Pav. — No. 8. On Margarita also. 

 SoLANUM POLYACANTHOS Lam., Illust., vol. 2, p. 23 (1793). — No. 17. 



Comparison of the Flora of Margarita and Coche with that 

 OF Other Regions. 



Two different points of view may be taken in comparing the floras 

 of various regions : one consists of a study of the lists of plants col- 

 lected from the regions in question, and the other consists of a study 

 of the types of vegetation. In using the former method one need only 



