JOHNSTON: FLORA OF MARGARITA ISLAND. 241 
CACTACEAE. 
Cereus Mill. 
C. CARiPENSis (HBK.) DC, Prod., vol. 3, p. 467 (1828). Cactus 
caripensis HBK., Nov. gen. et. sp., vol. 6, p. 66 (1823). — South Hill, 
El Valle, alt. 300 m., Johnston, no. 217, July 18. Further distribu- 
tion, Mexico. 
C. EBURNEUS Salm-Dyck, Obs. bot., p. 6 (1822).— El Valle, John- 
ston, no. 342, July 27. Further distribution, Cura^oa and Chili. 
C. Jamacaru DC, Prod., vol. 3, p. 467 (1828). — Tacarigua, 
Johnston, no. 341, Aug. 15. Further distribution, Brazil. 
C margaritensis Johnston, Proc. Amer. acad. arts and sei., vol. 
40, p. 693 (1905).— El Valle, on the hillside, Johnston, no. 344, July 
27. Endemic. 
C SwARTZii Griseb., Fl. Brit. W. Ind., p. 301 (I860).— Santa Ana, 
Ernst. Found also in Jamaica. 
Mammillaria Haw. 
M. SIMPLEX Haw., Syn. pi. succ, p. 177 (1812); Griseb., Fl. Brit. 
W. Ind. p. ■ 300. — Juan Griego, Ernst. Further distribution, Haiti 
and Venezuela. 
Melocactus Link & Otto. 
M. COMMUNIS Link & Otto in Verh. preuss. Ver. Gartenb., vol. 3, 
p. 417, pi. 11 (1827); Griseb., Fl. Brit. W. Ind., p. 300.— Juan 
Griego, Ernst; El Valle, plain by sea. Miller & Johnston, no. 272, 
Aug. 3; Pt. Moreno, Jo/i/i^to/i, no. 343, Aug. 10. Further distribu- 
tion. West Indies. 
Opuntia Mill. 
O. LEPTOCAULis DC. in Mem. mus. Par., vol. 17, p. 118 (1828). — 
En route El Valle to San Antonio, Johnston, no. 340, Aug. 3. Further 
distribution, Mexico. 
O. Tuna Mill, Gard. diet., ed. 8, no. 3 (1768); Griseb., FL' Brit. 
W. Ind., p. 302. — Common everyw4iere on the plains and hillsides. 
El Valle, Johnston, no. 218, July 4. Common in tropical America. 
Pereskia Mill. 
P. OPUNTIAEFLORA DC. in Mem. mus. Par., vol. 17, p. 76, p . 
19 (1828). — Pt. Moreno, Johnston, no. 216. Further distribution, 
Mexico. 
