INTRODUCTION. 
SOURCES OF THE LIVERPOOL FLORA. 
J^R. W. Withering, F.R.S., published his Arrangement cf 
British Plants , in six volumes, between 1776 and 1818. 
He gives local stations for some of our plants. His work is 
referred to in these pages as (W). 
Mr. T. B. Hall published, in 1845, the first local Flora 
of Liverpool. His work is referred to as (H). 
Dr. J. Dickinson, in 1851, issued a second Flora of 
Liverpool in the Transactions of the Literary and Philo- 
sophical Society of Liverpool. This was followed, in 1855, 
by an extensive supplement. His work is referred to as (D). 
Since the latter date, various articles and lists relating to 
the botany of the district have been published in the Transac- 
tions of local Societies, and in different Natural History 
publications. 
The Liverpool Naturalists Field Club, which was 
founded in i860, published, in 1872, the well known Flora 
of Liverpool , which was compiled from the above sources, 
together with the observations of a committee who explored 
the district for this purpose. 
This Club added three appendices to this Flora in 1873, 
1875, and 1887 respectively, and, since then, some additions 
have been published in the annual Proceedings of the Club. 
During the thirty years that have elapsed since the pub- 
lication of the last Flora, some species new to the district, 
and many new stations for species already noted, have been 
observed ; and also some species have, it is feared, become 
