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



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. 



India. 



4, 



Port Blair to Madras ; implying introduction from Southern 



implying introduction from Tenas- 



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. 





62 







65 







36 



29 













21 

 4 

 4 





Confined to India or only extending westward 

 Confined to Burma and Malaya or only extend- 



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



19 



It may therefore be concluded that there is a practical indifference 

 displayed as regards 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 the 

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



