110 A NEW FLOEA OF ' 



well-establish.ed plants wMch yet are likely to have been intro- 

 duced by horticulture by the name of Denizens. Of the first class 

 we have examples in the poppies, fumitories, Chrysanthemum 

 segetum, Centaurea cyanus : of the second in Ghelidonium majus, 

 the hellebores, and Saponaria officinalis. The species clearly 

 introduced and not well settled in are called Aliens. These 

 introduced plants have come from various parts of the world. In 

 the [Flora of Britain we have instances of American plants which 

 have thus become "naturalised" in Erigeron canadensis^ Mimulus 

 luteus, Coronopus didyma, CEnothera biennis, Oalinsoga parviflora, 

 and Anacharis alsinastrum. Our four common poppies grow 

 really wild in grassy places, Bheas in Sicily, and the other three 

 in Greece and the Crimea. Centaurea cyanus also comes from 

 Sicily, the common wallflower grows wild upon rocks in Greece, 

 Dattcra stramonium on the shores of the Caspian, Corydalis lutea, 

 Vinca major, and Petroselinum sativum also in the south-east of 

 Europe. "We have not attempted in this list to trace out the in- 

 troduced species to their sources, but only to place them in their 

 correct classes of citizenship, so far as the two counties are con- 

 cerned, as follows : — 



1. — The ITatives, so far as we can now judge, the aboriginal 

 possessors of the soil. 



2 and 3. — The Colonists and Denizens, the well-established 

 importations of the historic period. 



4. — The Aliens, importations not fully established. 



5. — The Incognita, species to be rejected from the list, either 

 as being extinct or requiring confijmation before they can be 

 claimed with safety. 



Types of Distrilution. — The readiest means of showing the 

 relation which the Flora of any county or province of Britain 

 bears to that of the whole island is furnished by Mr, Watson's 

 classification of the species under their "types of distribution" 

 as follows, viz. : — 



1. British Type. — Species which are more or less generally 

 diffused throughout the whole or nearly the whole of Britain. 



