Statistics of the Flora of the Northern States. 215 



I must not stop here to compare our flora with that of Europe 

 as respects the proportions of the predominant families. The 

 data on our part for such comparison are recorded above. I 

 pass on to notice some characteristic features which depend upon 

 positive differences in the families. 



The orders represented in the N. European flora and not in 

 ours are the Besedacew, Frankeniacece, Tamariscinece, Zygophyl- 

 lacece, Dipsacece 1 0 lobular iacece, and Butomacece ; — all very small 

 orders ; five of the seven are not represented at all by indigen- 

 ous species in North America ; two of them are represented on 

 our continent in what answers to the Mediterranean region. 



Of our 132 orders none is peculiar to our district, and only 

 two are restricted to the United States ; namely, Liwnanthaceoi, 

 of one species in the Northern States and one or two in Cali- 

 fornia, and Gfalacinece, of one genus and species, — a genus incertaz 

 sedis, rather than an order. 



Our orders peculiar to America are the following : — 



Sarraceniace^e, Cactacese, Hydrophyllacese, 



Limnanthacese, Galacineae, Bromeliaceae ; 



Loasaceae, 



all of which, except Galacinece and perhaps Bromeliacece, are also 

 represented on the western side of our continent. Besides these 

 the following 19 orders are extra-European. Those which have 

 known representatives in western North America, that is, in 

 Oregon and California, are repeated in the second column ; those 

 known in corresponding parts of eastern Asia, i. e. in Japan, 

 China, and the Himalayas, in the third column. ' 



Extra-European Orders not peculiar to America. 



Extra-European Orders of the 

 Flora of the Northern States. 



IVlagnoliaceae. 



Anonaceae. 



Menisperrnaceae. 



Nelumbiaceae. 



Cabombacese. 



Calycanthaeeae. 



Melastomaceae. 



Passifloracese. 



Hamamelacae. 



Sapotaceae. 



Bignoniaceae. 



Nyctaginaceae. 



Phytolaccaceae. 



Saururaceae. 



Podostemaceae. 



Burmanniaceae. 



Hcemodoraceae. 



Commelynaceae. 



Xyridaceae. 



Also repiesented in Western^ 

 N. America. 



Bignoniaceae (Martynia) ? 

 Nyctaginaeese. 

 Phytolaccacese. 

 Saururaceae. 



Represented in Jnpan } China 8 

 or Himahyae. 



Magnoliaceae. 



Anonaceae. 



Menispermaceae. 



Nelumbiaceae. 



Cabombaceae. 



Calycanthaceae. 



Melastomaceae. 



Passifloraceae. 



Hamamelaceae. 



Sapotaceae. 



Bignoniaceae. 



Nyctaginaceae ? 



Phytolaccaceae. 



Saururaceae. 



Podostemaceae. 



Burmanniaceae. 



Commelynacese. 

 Xyridaceae. 



