1890.] D. Prain — Tlie non-indigenous species of the Andaman Flora. 257 



implying introduction from Southern 

 implying introduction from Tenas- 



1. Calcutta to Port Blair ; implying introduction from Northern 

 India and especially the Gangetic plain. 



2. Port Blair to Rangoon ; implying introduction from Lower 

 Burma. 



3. Port Blair to Madn 

 India. 



4. Moulmein to Port Blair ; 

 serim — a route used by native craft. 



5. Port Blair to the Nicobar Islands ; implying introduction from^ 

 these — the Nicobars are a dependency of the Settlement at Port Blair. 



The distribution of the majority of these introduced species is so 

 wide that (with the exception of 4 species whose introduction has al- 

 most certainly been confined to the Rangoon or the Moulmein route 

 and other 4 almost certainly restricted to the Madras or the Calcutta 

 route) any one of them may have equally well reached the Settlement 

 by any or all of these routes. This is best shewn by a tabular view of 

 the species thus introduced. 



Table II. Distributional features of the Non-indigenous element in 

 the Flora of the Andamans. 



Cosmopolitan in the Tropics 



62 





Indigenous in the Old World .,, 



65 



In other continents besides Asia 





36 

 29 





Confined to Asia 







Throughout South-Eastern Asia 



21 

 4 

 4 





Confined to India or only extending westward 

 from India • 



Confined to Burma and Malaya or only extend- 

 ing eastward thence 



Indigenous in the New World, but now cosmopolitan! or nearly so 



19 



It may therefore be concluded that there is a practical indifference 

 displayed as I'egards route ; here, as everywhere else, when man is en- 

 gaged in cultivation he involuntarily introduces weeds, and here as else- 

 where a certain proportion of the species introduced by him for economic 

 or for aesthetic reasons escape and become spontaneous. 



It has been already said that the present Settlement occupies tEe 

 Bite of an earlier one. This earlier settlement was founded under the 



