474 MONOGRAPH OF THE BRITISH SPECIES OF EUPHRASIA. 



are found in the same neighbourhood. It decidedly approaches 

 E. occidentalis in size and in general character, but the presence of 

 shortly stalked glands, in more or less abundance, shows its relation 

 to E. brevipiia. It is not unfrequent on the low pastures near to the 

 sea in Morar Bay south of Beoraidbeg, in Scotland. 



E. BREViPiLA X ScoTicA. E. venusta Towns. 



Differt ab E. brevipiia coroUis minoribus, foliis bracteisque 

 minoribus, et angustioribus, iis deutibus paucioribus, capsulis 

 longioribus ; ab E. Scotica caulibus crassis, ramis uumerosis et 

 longis, planta tota glandulosa, pilis glanduliferis brevissimis. 



I found this hybrid in localities where both the parents occurred, 

 in the neighbourhood of Poolewe in Ross-shire, where E. Scotica 

 descends to within a few feet of sea-level. 



E. Scotica x gracilis. E. electa Towns. 



Differt ab E. Scotica iloribus purpureis, labio infero labium 

 superum excedente, ab E. gracilis bracteis viridisceutibus majoribus 

 et latioribus. 



I found this evident hybrid on wet slopes on the moors near and 

 above Loch Maree Hotel, on Loch Maree (Ross-shire), where both 

 the parent species grow together. The plant has the flowers of 

 E. fjracilis, but the foliage and habit of E. Scotica. 



It will be observed that I have ventured to differ but little from 

 Prof. Wettstein's views in the determination of species, particularly 

 as for the most part my own observation confirms them. His 

 opinion and demonstration that the forms which he describes as 

 species have definite areas of distribution and that the areas of the 

 more nearly allied species do not intercross, necessarily lead to the 

 assumption that these forms, though nearly allied, must be looked 

 upon as more or less established, but with less specific rank, 

 whether species or subspecies ; E. latifolia, E. Euulaends, E. nemo- 

 rosa, E. curta and E. occidentalis are instances. On the other hand 

 the Professor demonstrates that forms whose areas do intercross 

 are evidently more distantly allied and must consequently be con- 

 ceded greater specific rank ; E. Eostkoviana, E. brevipiia, E. gracilis, 

 E. Scotica, E. Salisburgoisis are instances. I conceive he does not 

 consider the time has yet come to group the species or subspecies 

 of the genus satisfactorily, as we have yet much to learn respecting 

 the distribution and the constancy of the characters of several of 

 them. I perhaps somewhat prematurely attempted such grouping 

 in my paper already alluded to in the footnote on page 322, but I 

 do not regret having made the attempt, as the conclusions I arrived 

 at from morphological study alone are in the main borne out or 

 supported by those which have been so ably arrived at by Prof. 

 Wettstein's study of areas of distribution. 



