84 Statistics of the Flora wis the Northern States. 
genous to Great’ Britain. Of the remainder we have here gen- 
era strictly analogous to each, except to Erica, Daphne, and 
Ulex. On the other hand, indeed, we have 46 extra-European 
genera of trees and shrubs, showing our ry eens. richness in this 
respect, which has often been remarked u but, excepting 
Heaths, Furze, and seeing we lack ie os North Eu- 
ropean ‘arborescent or woody type. 
s to glumaceous plants,—likewise so prolific in individuals, 
—only three British genera of Cyperacee and 9 of Grasses are 
wanting here 
A vast preponderance of our species throiiphout belong - 
genera common to Europe. This has already been noted, 
respects the orders, in my former article (p. 216). It is atid 
true as to the genera, as the following data serve to show 
e Phanogamous genera in our flora, as has been already 
— average oe species apiece; and fully half of them are 
ted b e than one eel But of the 353 extra- 
an of our genera common to Peryten are - repres esented al 
our flora by 9 or more species (at excluding the naturalized 
ones), and the 34 larger genera average as much as ten indigen- 
ous species apiece. 
As to the relative number of species in our 34 largest amphi- 
geean genera, it may be interesting to note that their sum in our 
flora is 637 species; in the Flora Germanica of Koch, 621;— 
the naturalized plants not being excluded; but these are quite as 
numerous in the German flora as in ours. Also 20 of —_ 
genera are larger in our flora than in the German. If the 
mitted species were brought to a common standard, the numbers 
woul 1 more decidedly in our favor. The large genera 0: 
which we possess the superior number of species are Carew (132 
to 1), Panicum (20 to 7), Polygonum, Cyperus (19 to 7), Quereus 
(18 ot oma (16 to - ony to ‘ete haris 
0 
é ay (tb seer 
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