246 D. Prain — The non-indigenous species of the Andaman Flora. [No. 3, 



that affect a drier climate than that of the Andamans ; such species 

 have been distinguished by an (*) : — 



2. Such as might be expected to hold their own in the struggle for 

 existence should the Settlement happen to be abandoned — a class the 

 precise limits of which cannot be laid down with certainty ; this is the 

 class not marked (*) and at the same time not noted as occurring spon- 

 taneously ; it is moreover from this that the next class is recruited ; 



3. Such as are naturalised in the Andamans now — the species for 

 which there was evidence either in 1866 or 1890 that spontaneous 

 appearance has actually commenced. 



The two former classes do not require further consideration ; taken 

 in detail we find that of the last class 14 species were naturalized prior 

 to 1866. These were :— • 



Impatiens Balsamina. Lantana camara. 



Clitoria Ternatea. Stachytarpheta indica. 



Cajanus indicus. Ocimum sanctum. 



Carica Papaya. Oomphrena globosa. 



Vinca rosea. Canna indica. 



Ipomoea Quamoclit. Cocos nucifera. 



Solanum Melongena. Cynodon Dactylon. 



Before 1889 14 other species, that had been introduced prior to 1866 

 but had not at that date become naturalised, had begun to appear spon- 

 taneously. These were : — 



Sixa Orellana. Capsicum minimum. 



Gossypium barbadense. Datura fastuosa. 



Moringa pterygosperma. Vitex trifolia. 



Trichosanthes cucumerina. Mirabilis Jalapa. 



Luffa cegyptiaca. Hicinus communis. 



Zinnia elegans. Casuaria equisetifolia. 



Tagetes, sp. Ooix Lachryma. 



At the same time 9 other species not present in the Andamans at 

 all in 1866 were nevertheless appearing spontaneously in 1890. These 

 were : — 



Phaseolus trilobus. Ipomcea coccinea. 



Bauhinia acuminata. Torenia, sp. 



Pithecolobium didce. Thunbergia alata. 



P. Saman. Deeringia celosiodes. 



Oolocasia antiquorum. 

 So that in 1890 there were in the Andamans no fewer than 37 

 species occurring spontaneously that had originally been intentionally 

 introduced, as against 14 species of this kind in 1866. 



It is necessary to note further that one species, Zea Mays, which 



