GENERAL SUMMARY. 
In the present work 1155 species of flowering plants and 53 Ferns are 
enumerated. Out of these, T3 flowering plants and 8 ferns are either 
certainly erroneous, or cannot he received with confidence as Yorkshire 
plants without further confirmation of their occurrence. Of the remain- 
ing 1082 flowering plants, 31 are naturalized species only, which are not 
included in the fourth edition of the London catalogue, and one (Salix 
acutifolia) has been discovered since it was printed. So that out of 1445 
flowering plants enumerated in the catalogue, 1051 species, or 72 \ per 
cent, and out of 60 ferns, 45 species, or 75 per cent, have been ascertained 
at the present time to inhabit Yorkshire. If we deduct the alien species 
of flowering plants the relative proportion of the floras, in the number of 
species which they contain, still remains nearly the same ; for out of 1336 
species enumerated in the catalogue, we may claim 955, or 71 % per cent. 
But out of 1336 flowering plants enumerated in the catalogue, 31 species, 
and out of 60 ferns, two species, belong exclusively to Ireland or the 
Channel Islands. So that the true proportion which the ascertained 
Yorkshire flora bears to the ascertained British flora is 71 % per cent, or 
1001 species to 1339. 
The following is a tabular summary of the species enumerated in the 
present work, arranged according to the categories of citizenship under 
which they are placed : — 
Flowering Plants. 
Native 893 
Denizen 36 
Colonist 27 
•956 
55 
Ferns (Native) 
1001 
