XI. CLIMATAL ZONES. 



497 



with strict accuracy in any zonal or climatal arrangements 

 of a flora ; although with due care, and an ample supply 

 of data, the interference may usually he kept within a 

 narrow compass. Suhject to these explanations, the 

 subjoined double series of names may suffice to charac- 

 terize the half-dozen zones passably well by the plants 

 which occur in them : — 



Upper limits. 



6. 

 Salix heibacea. 

 Silene acaulis. 

 Gnaphaliuin supinum. 

 Vaccinium Myrtillus. 

 Enopetrum. Azalea. 

 Vaccinium uliginosnni. 



5. 

 Calluna. Trollius. 

 Ei'iophorum vaginatum. 

 Pingiiicula vulgaris. 

 Arbutus Uiva-ursi. 

 Geum rivale. 

 Scubiosa succisa. 



4. 

 Erica cinerea, Tetralix. 

 Prunella. Pinus ? 

 Genista anglica. 

 Salix auvita, vepens. 

 Rubus idaeus. Myiica. 

 Spartium. Digitalis. 



3. 

 Pteris (rarely higher). 

 PopuUis treinula. 

 Alnus. Corylus. 

 Quercus. Lonicera. 

 Cratajgus. Ilex. 

 Hedera. Fiaxinus. 



Lower limits. 



6. 

 Luzula arcuata. 

 Saxifraga cernua. 



rivularis. 



caespitosa. 

 Stellaria cerastoides. 

 Draba rupestiis. 



5. 

 Cherleria. Azalea. 

 Myosotis alpestris. 

 Alopecurus alpinus. 

 Veronica alpina, saxatilis. 

 Juncus Irifidus, castaneus. 

 Salix herbacea. 



4. 

 Sibbaldia. Pseudathyriuni ? 

 Gnaphalium supinum. 

 Epilobium alpinum. 

 Luzula spicata. 

 Juniperus nana. 

 Saussurea. Lloydia. 



3. 

 Arbutus. Oxyria. 

 Saxifraga stellaris. 

 Tlialictruni alpinum. 

 Aldiemilla alpina. 

 Epilobium alsinituiium. 

 Allosorus. Tolieldia. 



VOL. IV. 



3s 



