JOHNSTON: FLORA OF MARGARITA ISLAND. 293 
OCHNACEAE. 
GoMPHiA PYRiFOLiA Griseb., Fl. Brit. W. Ind., p. 105 (1859).— Xo. 
20. A tree, about 3 m. high. 
TURNERACEAE. 
^ TuRXERA 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 Flor.\ 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 t}j>es of vegetation. In using the former method one need only 
