Xxx INTRODUCTION. 
and there is every reason to believe that China contains 
very many undescribed species. 
“Europe has twenty-five species: of which five sixths 
exist between 40’ and 50°. The countries bounded by 
these parallels must therefore be considered as forming 
their principal range. To the south of this they de- 
crease in number much more rapidly than to the north. 
Britain, which lies just without its northern limits, has 
ten species, Denmark seven, and Holland thirteen; 
whilst in Spain, Portugal, and the Levant, which bear 
nearly the same relation to it on the south, only four 
species have been observed. Many are peculiar to cer- 
tain districts, as reversa, myriacantha, hibernica, and 
involuta ; others to countries, as the majalis of Sweden 
and Denmark; and glutinosa of the Levant. Some 
few are only confined by the extreme limits of the 
genus; thus spinosissima is common to the dreary wilds 
of Iceland and the sultry shores of the Mediterranean; 
canina grows from the confines of Angermannia to the 
most southern regions of Europe; thence extending 
into Egypt. 
. In the North of Africa are two species peculiar to 
that country; and two others common to it and Eu- 
rope. . 
Fourteen species have been found in North Ame- 
rica, none of which except R. Montezuma and stricta 
have much general resemblance to European Roses. 
It is not unworthy of notice that R. laevigata of the 
woods of Georgia is so similar to the R. sinica of China 
as not to be immediately distinguishable from it. The 
latter is even sold in some of the London nurseries as’ 
an American Rose under the name of R. Cherokeensis. 
