MOUNTAIN FLOEA OF GREAT ATLAS. 



443 



endemic form, and one is related to a species indigenous in the 

 Alps and other high mountains of Central Europe. 



While recognising the fact that the relations between the 

 vegetable population of the Great Atlas and that of the south 

 of Spain are less close than might have been expected on 

 theoretical grounds, we must yet admit that, on the whole, the 

 Great Atlas is more nearly connected in a botanical sense with 

 this than with any other mountain region that is known to us ; 

 and it becomes a matter of some interest to compare closely the 

 list of species obtained by us in the Atlas, with the comparatively 

 well known Flora of Southern Spain. The results of this com- 

 parison are given for the Great Atlas generally, and for the 

 superior zone separately, in the following table, in which the 

 Atlas species are distinguished under five heads : 1, those foimd 

 in the higher region of the Sierra Nevada; 2, in the mountain 

 region of Andalusia ; 3, in the lower warm region below the 

 level of about 2,000 feet ; 4, absent from Southern Spain, but 

 found in the central or northern provinces ; and 5, those not 

 included in the Spanish Flora. 



Table III. 



The figures given in this table are of much interest, proving, 

 as they do, the wide differences that exist between the Floras of 

 two mountain regions not widely separated from each other, 

 and exposed to climatal conditions not altogether dissimilar. 

 We see that three-sevenths of the plants found in the higher 

 region of the Great Atlas are absent from the South of Spain, 

 and that the same remark applies to considerably more than 

 one-third of all the plants found in the portion of the Great 

 Atlas visited by us, although a notable proportion (in both 

 cases) is to be found in Central and Northern Spain. Especially 

 noteworthy is the fact that many of the species thus absent in 

 Southern Spain are plants of Central Europe, most of which 



