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





Names of Species. 



Remarks. 





Phaylopsis parviflora Willd, 



Rare, on Ross only (K.). 





Eygi'ophila quadrivalvis Nees. 



Common in wet places along with Jussicea and 

 Ludwigia. 



95 



Lippia geminata H. B. K. 



At Namnna ghat (K), rare. 





Hyptis brevipes Poit. 



Common (K.). 





Bcerhaavia repens Linn. 



Not common and not met with by Mr. Kurz ; 

 it may, however, be indigenous ; it certainly 

 seems to be so on Great Coco Island. 





Aerna lanata .Tuss. 



Not very common. 





Achyranthes aspera Linn. 



Very common in every part of the settlement 

 and penetrating into the jungles. 



100 



Phyllanthus urinaria Linn. 



Common on Ross and on Mt. Harriet ; not so 

 plentiful at Aberdeen. 





Monochoria vaginalis Presl. 



In ponds at Aberdeen ; perhaps introduced by 

 means of wading-birds.* 





Paspalnm distichum Linn. 



Common on Ross and at Hopetown. 





P. pedicellatum Nees. 



Common on Ross, not seen elsewhere. 





Panicum erucseforine Sibth. 



Aberdeen, common. 



105 



P. excurrens Trin. 



By edge of pond at Aberdeen. 





P. longipes W. 8f A. 



On Mt. Harriet. 





P. myosuroides B- Br. 



Very common. 





Imperata cylindrica Kxinth. 



Common everywhere. 





Rottboellia exaltata Linn. 



Common in marshy ground about Aberdeen 

 and Haddo. 



* There is another species that has, however, been excluded from this list, be- 

 cause neither Dr. King in 1890 nor the writer in 1889 met svith it, to which the same 

 remark applies. This species is Barclay a longifolia. The Andamans is first given 

 as a locality for this species in King : Materials for a Flora of the Malayan P-eninsula, 

 p. 34. The Andamans specimens were obtained by one of Dr. King's garden col- 

 lectors in 1884 in a ditch among rice-fields near Haddo. It may be said with some- 

 thing like certainty that the species was not there in 1858 ; at all events there was 

 no rice-field and no ditch then. And it is almost as certain that it was not present 

 in I860, for Mr. Kurz, as his Report shews, gave particular attention to aquatic 

 vegetation, yet he did not meet with it. Probably the ditch where Dr. King's 

 collector found Barclays, like the pond where the writer found Monochoria and 

 Ceratopteris, did not exist at all in 1886. Another circumstance that tends to con- 

 firm the idea of the introduction being recent is that it does not appear to be 

 present in any of the ditches or ponds examined by the writer in 1889, and Dr. King, 

 to whom this fact was particularly mentioned, and who looked for Barclaya with 

 especial care in 1890, was equally unsuccessful in his search. It may, therefore, be 

 safely presumed to be still quite local. For the appearance of Barclaya, as for 

 that of Monochoria, bird-agency at once suggests itself ; introduction by indirect 

 human agency is not, however, precluded in either case. Allowing the mode of 

 introduction to be a point altogether doubtful, there still remains an interesting 

 fact — this species (like Desmodium auricomum) is one hitherto only known from the 

 opposite shores of the Andaman Sea. And this fact weakens the evidence from 

 other sources as to introduction ; for it is the Burmese, and particularly the Pegu- 

 Tenasserim element, that seems to predominate in the indigenous Andaman flora. 



