SUMMAEY 



Plants native to Berkshire ..... 893 

 Plants which are denizens only . . • . 45 



Colonists 56 



994 

 Species with erroneous or uncertain record . . 11 



Plants now probably extinct in the county . . 4 



Plants of casual occurrence or introduced . . 199 



Total . 1208 



Thirty-three species have been erroneously recorded in addition to 

 the above figures. 



About 400 named varieties and forms and 70 hybrids have been 

 observed. 



In the Compendium to the Ctjbele Britannica, Mr. H. C. Watson made 

 a classification of the British plants according to their distribution ; he 

 regarded the universally distributed plants as ' British,* the southern 

 plants as 'English/ the species having their head-quarters in the 

 western counties as 'Atlantic,' and the eastern plants as 'Grermanic,' 

 while the northern species were ' Scottish ' or ' Highland ' ; * Inter- 

 mediate ' was applied to plants having their head-quarters in the Mid- 

 lands and thinning out to the north or south ; and ' Local * was applied 

 in a few cases to almost isolated species. These terms were further 

 differentiated by combining them ; thus, British-English means a 

 plant of wide diffusion, with a tendency towards the southern type, 

 and ' English-British ' signifies a plant of a southern type widely 

 diffused. 



Adopting the specific limits laid down by Mr. Watson (and omitting 

 114 critical and other species, some of which have been included in the 



S S 



