Barrington — Report on the Flora of Lough Erne. 5 



600 species, or a little more than half the Irish flora. The absence of 

 Papaver rhceas from the west of Ireland is well known ; but on the 

 east coast, especially in parts of Dublin and "Wicklow, it is the com- 

 monest of all weeds of cultivation. 



Why is this species so rare in western Ireland ? Its seeds are 

 produced in thousands, and the facilities for its introduction in seed 

 corn are evident. 



The most interesting species observed were — Caltha radieans, Carex 

 elongata, Rosa villosa, Potamogeton filiformis, P. zizii, Ruhus hemiste- 

 mon, Sieraciwn umbellatum, Stello/ria glauca, and Nasturtium sylvestre. 



Caltha radieans is new to Ireland, and its only British locality is 

 in Forfarshire, where, I believe, it has not been found recently. My 

 specimens want radical leaves and sepals ; the latter were much nar- 

 rower than in Caltha palustris, and fell olEf in the vasculum. Ruius 

 hemistemon and Potamogeton zizii are also new to Ireland. The latter 

 has been recorded by Mr. Stewart '^ since I gathered it in 1881. A 

 few of the critical species were brought for comparison to the Her- 

 baria of Cambridge and Kew, and I have to thank Professor Babington 

 and Mr. J. G. Baker for looking over some of them. At the British 

 Museum Mr. Carruthers gave me every facility for comparing critical 

 species with the fine series of specimens there. 



This report is not so complete as is desirable. To examine 150 

 miles of shore in three weeks with care was not possible, many 

 islands and localities were unvisited. The district is not an unpro- 

 ductive one, and yet the negative results are numerous.^ On a future 

 occasion I hope to be enabled to present to the Academy a supple- 

 mental report, and institute a comparison between the Elora of the 

 shores of Lough Erne and other Irish lake districts. 



^li., p. 542. 



^ Ranunculus auricomus, JR. Jicaria, Geranium inolle, Peplis portula, Hippuris 

 vulgaris, Cotyledon umbilicus, CEnantheJistulosa, Daucus carota, Matricaria inodora, 

 Scrophularia aquatica, Veronica agrestis, V. polita, V. anagallis, Teuerium scoro- 

 donia, Myosotis repens, TTtricularia vulgaris, Humex conglomeratus, Folygonum 

 lapathifolium, Euphorbia peplus, Viola palustris, and many other common species, 

 were not seen. Neither were any species of the genera, Fumaria, Drosera, Silene, 

 and Montia observed ; but I hope to reduce the list on my next visit to Lough 

 Erne. 



[List of Species 



