334 



MONOGRAPH OF THE BRITISH SPECIES OF EUPHRASIA. 



Prof. Wettstein thinks that, being so nearly related, they have their 

 origin from an ancestor which once had a wider range, and that 

 further research may extend the range of one or other of these 

 existing species. Scheme IV. shows the phytogeny of the Grandi- 

 Jlora. 



Scheme IV. 



Parent Species. 



Eecent Species. 



E palcBo-RostJuvzancv? E .jjalceo -alpiruv 

 K. tiostkoyux na.s 



Section I., Eueuphrasia; Subsection I., Semicalcarat^ ; 



Group III., Angustifoli^e. 

 This group includes ten species, viz. E. Porta Wetts., E. Salis- 

 buir/ensis Funck, E. Illyrica Wetts., E. tricnspidata L., E. cuspidata 

 Hort., E. Dinarica Beck (Murb.)., E. italica Wetts., E. Stiriaca 

 Wetts., E.japonica Wetts., E. insi(/nis Wetts. With the exception 

 of the two last-named species, which are natives of Japan, the 

 species of this group have a remarkable distribution, east and west 

 in South Europe and in isolated portions of North Europe. The 

 Japanese and European species are doubtless closely allied, but no 

 representatives of the group occur at the present in any intermediate 

 area. As regards the European species, they represent two morpho- 

 logical series : the first includes E. tricnspidata, E. cuspidata, 

 E. Dinarica, E. Stiriaca, E. Italica ; the second includes E. Salis- 

 burgensis, E. Porta, and E. Illyrica. Putting aside E. Stiriaca 

 and E. Porta, which are quite local and of hybrid origin, it is here 

 again most remarkable, as has already been noticed with regard to 

 species in the group Parvi flora, that the areas of the more nearly 

 related species do not intersect, whereas those of less closely allied 



