INTRODUCTION. 
X1U 
versally acknowledged, at the present day, to be neither 
indigenous- to the British Isles, nor naturalized among 
us. In this work we have permitted them to remain, 
except in a few instances, where there are grounds to 
believe that the original specimen was obtained from 
a garden, or that one plant had been mistaken for 
another. Those, however, which no longer exist in 
the given localities, or are known to occur only in culti- 
vated fields, and to disappear with the crop, are usually 
placed within [ ], while the many that have been or are 
daily becoming naturalized among us, whether by the 
agency of man or of birds (unless such as are now com- 
mon weeds, as JEgopodium Podagraria, Chrysanthemum. 
Leucanthemum, C. segetum, Centaurea Cyanus, Anagallis 
arvensis, &c.), are branded with an asterisk (*). There 
are also numerous ones, as the Impatiens fulva and 
Lilium Martagon, which can have no claim whatever to 
a place in our Flora : in many cases, however, they have 
been briefly noticed at the close of an allied species or 
genus ; and when the genus itself is not British, an 
abridged character of it has been sometimes introduced 
into the conspectus at the head of its proper order, 
especially where the plant, like the Mimulus guttatus, is 
now so widely diffused that it might otherwise puzzle 
a student. With regard to synonyms, they are, with 
few exceptions, confined to that of the writer who 
first described the plant under the name adopted, or 
to the cases where a different name has been given 
by the authors of other Floras of this country ; but 
the reader will always find a reference to English 
Botany ( E . B.) and its Supplement (E. B. S.). Those 
who desire a further knowledge of the various names 
which a species has unfortunately received, as well as a 
full specific character, or such as will exclude all other 
known plants wheresoever found, can only attain this 
