ON THE FLOKA OF NORTH-WESTERN DONEGAL. 271 



ON THE FLOEA OF NOETH-WESTEEN DONEGAL. 



By Henry Chichester Hart, B.A. 



In continuation of my former papers on this subject (see 

 'Journ. Bot.' for 1879), I now beg to offer the results of my 

 explorations carried on during tlie year 1879 ; from which it will 

 appear that this remote and mountainous district is not without 

 its fair proportion of rarities. I feel especial pleasure in being 

 able to add to the list three alpine plants so rare in Ireland as 



Saussurea al/nna, Sa.vifraga hirtu, and Polygonum ririparum. 



The following are also important additions to the flora of the 

 county : — Potamogeton JiUforrrm, Festuca sylcutiat, and Zostera 

 nana(?) ; while, although not indigenous, the occurrence of Allium 

 Babintjtonii extends considerably the known range of this nearly 

 disused pot-herb. 



Altogether, since I commenced the careful investigation of the 

 Botany of Donegal, I have succeeded in adding nearly 100 species 

 of flowering plants and ferns to the list of the county as it stood in 

 18G6, the date of the publication of the ' Cybele Hibernica.' Of 

 these, the five or six alpine species considerably increase the interest 

 of the flora, and place Donegal in its proper botanical position as 

 the most northern in Ireland. In my previous list I enumerated 

 625 species ; in the present paper there are 72 additions, making a 

 total of 597 species. By the addition of a few plants which I have 

 omitted from the above total as being varieties, or sub-species, the 

 flora of North-West Donegal may be set down at 600 plants at the 

 lowest. So little was the flora of the county known in 1866 that 

 the whole number was then reckoned at 550 species, and of these 

 40 have not been observed in my district. By adding tins last 

 number to the GOO above given, we shall have a present total oi 

 040 species, so that the entire list for the county may be expected 

 to reach a total of at least 650 species. 



The following plants are additions to District 11 of Moore and 



More's ' Cybele Hibernica ': 



JThalictrum minus. f Valerianella dentata. 



*Corydalis lutea. *Petasites fragrans. 



Lepidium Smithii. [Antennaria margantacea] . 



Sagina apetala. Saussurea alpma. 



tAcer campestre. {Cichorium Intybus. 



:;: A. Pseudo-platanus. Lamium mcisum. 



tPrunus Cerasus. jLysimachia Mnnnularia. 



Eyrus Malus. Polygonum viviparum. 



Eosa arvensis. Callitnche hamulata. 



*Eibes Grossularia. +Salix Smithiana. 



Saxifraga hirta. *I*M fetidissima. 



[S. Cymbalaria] . t Allium Babmgtonii. 



tApium graveolens. Zostera nana ?). 



^Ethusa Cynapium. Potamogeton hhfornns. 



*Eetroseliuni sativum. *^ tuca sylvatica. 



