XII. TYPES OF DISTRIBUTION. 4U9 



of latitude 53, may be deemed to have their lower limits 

 in the inferagrarian zone ; at any rate, while looking only 

 to Britain. Those selected for examples are such as 

 prevail more in Middle or North Britain, or (Meconopsis) 

 on the hnis of Wales, and which do not occur in the 

 Channel Isles. All of them, however, are reported" in 

 continental Normandy-, with the exception of Pyrola 

 media. 



It appears quite unnecessary to repeat long lists of 

 names here, for the purpose of exemplifying the regional 

 or zonal floras in fuller detail. The zones for each sj)e- 

 cies were indicated in the summary of distribution ; from 

 which any required lists can now readily be made, with- 

 out the troublesome necessity of turning over all the 

 pages of the preceding volumes. And in the seventh and 

 eighth divisions of this volume — ' areas ' and ' altitudes ' — 

 the species are enumerated in series and groui^s according 

 to those geographical conditions with which the zones are 

 most intimately connected, and in the climatal and floral 

 characteristics of which they have really originated. 



12. Types of Distrihition. 



This manner of viewing the distribution of plants 

 within Britain was explained in volume first, on pages 43 

 to 55. It was again adverted to on page 232 of the pre- 

 sent volume, in explaining the abbreviations used in the 

 summary of distribution. Perhaps the ' areas of species ' 

 may now afford better data towards rendering such a 

 geographic grouping of the British flora more fully intel- 

 ligible. It has been much misapprehended by certain 

 geologists, and perhaps by some botanists likewise. 



On glancing over pages 282 to 302, it may be seen that 

 most of the ' austral species ' commence quite in the South 



