98 DISTRIBUTION OF BRITISH PLANTS 



15. Cornus sanguinea, Ribes nigrum, R. alpinum, Prunus Ce- 

 rasus. 



16. Acer campestre, Berberis vulgaris, Ligustrum vulgare, Rham- 

 nus catharticus, Pyrus domestica, P. torminalis, P. communis, Vibur- 

 num Lantana, Viscum album, Daphne Laureola, Ononis spinosa 

 Carpinus Betulus. 



17. Clematis Vitalba, Genista pilosa, Hippophae rhamnoides, Buxus 

 sempervirens. 



18. Tamarix gallica, Erica ciliaris, E. vagans, Lonicera Xylos- 

 teum. 



Let this list be compared with the distribution of the 

 same species before pointed out, from Spitzbergen, along 

 the north coast of America and islands, to Faroe, and 

 it will be at once seen how close is the resemblance, 

 although the order of succession is not quite the same ; 

 indeed, we cannot be assured that either sequence is 

 rigidly correct. 



The celebrated De Candolle has published a " Memoir 

 on the Geography of the Plants of France, considered in 

 relation to absolute Elevation." He divides them into five 

 groups or tables, as below : — 



1. Species never found in France below about 2000 

 metres of absolute height. 



2. Species found only between 1000 and 2000 metres. 



3. Species growing indifferently above 1000 and 2000 

 metres, but not below. 



4. Species pro wing indifferently above and below 1000 

 metres, the difference between the minimum and maximum 

 being 1000 metres or more. 



5. The remaining species grow below 1000 metres. 



The altitudinal range of each species, named in the 

 four first lists, is thus given. 



