673 



I mav mention the following 1 : /. Mgosolis arvensis; 2, M. palu- 

 stris; •'>, M. repens; 6, Campanula rotundifolia ; 8, Achillea Ptarmica; 

 24, Menganthes; 27, Mentha aquatica; 30, Lobelia Dortmanna; 32, Plan- 

 tago Coronopus; 36, Anagallis tenella; 37, Lysimachia nemorum; 38, Pri- 

 mula acaulis; 40, Galium palustre; 52, Veronica Beccabunga; 60, Calli- 

 triche autumnalis; 61, Alsine verna; 70. Melandrium rubrum; 93, Suhu- 

 laria aquatica; 94, Drosera rotundifolia; 99, Hgpericum quadrangulum ; 

 116, Polggonum amphibium, 136, Geum rivale; t38, Potentilla palustris; 

 l'il. Rosa mollis; H>o. Viola tricolor; 176, Carex leporina; /<S'.>, Heleo- 

 charis multicaulis; 190, Agropgrum junceum; 202. Catabrosa aquatica; 

 214, Phragmites communis; 221, Psamma arenaria; 223, Iris Pseudacorus; 

 224-, Juncus balticus; 230, J. obtusiflorus; 242, Habenaria albida; 244, 

 Listera cordata; 245, Malaxis paludosa; 248, Orchis masculus; 249, Pota- 

 mogeton alpinus; 250, P. filiformis; 256, P. prælongus; 25'/. V. pusillus; 

 258, Ruppia; 259, Zostera marina; 271, Lgcopodium annotinum; 274, 

 Aspidium Drgopteris; 279, Asplenium Adiantum nigrum; 280, A. Trichomanes. 



Among 285 of the numbered species in Ostenfelds Flora, 

 46 of them are very rare, or no less Ihan 16%, and that nolwilh- 

 standing my having omitted all the like numbered species which 

 are presumably hybrids, also all the alpine species occurring on 

 mountain heights, and a species like Juniperus, which has doubt- 

 less heen reduced in quantity by man. 



Now it may be objected that all the above-mentioned species 

 are not of equal importance in regard to the present question, and 

 some of them are perhaps rare simply because they lack suitable 

 localities in the Færoes, e. g. Psamma, or because the country has 

 nol been completely investigated. But then, on the other hånd, I 

 have omitted a great many species, which also appear to be rare, 

 and occur dispersed over the islands in a few localities only, 

 though they could doublless grow in many other piaces, and will 

 presumably in time be more largely distributed. 



The faet that about Ve of the species, met with on ;i single, small 

 area, occur so sparsely, appears to me to be a strong evidence of 

 their having been introduced to the islands at a comparatively late 

 period. It is no easy malter to comparc the flora of the Færoes 

 with others which may be placed on an equal fooling lo it. I have. 

 however, atlcmpled to do so, and I lind that South-wesl Zealand. 

 according to P. Nielsens Flora, has 1 /io species only which mav be 

 said to be as rare as those of the Færoes. 



It also appears to me that an unusually large numher of species 



1 The number attached to each species is that under which the plant is 



ehumerated in Ostenfelds list, the latter ma}- thus be easily consulted ;is regards 

 the habitats. 



