222 DARWINIANA. 



or two mostly very similar species in California and 

 Oregon. 



Our May-flower (Epigsea) and our creeping snow- 

 berry, otherwise peculiar to Atlantic North America, 

 recur in Japan. 



Our "blue cohosh (Caulophyllum) is confined to the 

 woods of the Atlantic States, but has lately been dis- 

 covered in Japan. A peculiar relative of it, Diphyl- 

 leia, confined to the higher Alleghanies, is also repeated 

 in Japan, with a slight difference, so that it may barely 

 be distinguished as another species. Another relative 

 is our twin-leaf (Jeffersonia) of the Alleghany region 

 alone : a second species has lately turned up in Man- 

 tchooria. A relative of this is Podophyllum, our man- 

 drake, a common inhabitant of the Atlantic United 

 States, but found nowhere else. There is one other 

 species of it, and that is in the Himalayas. Here are 

 four most peculiar genera of one family, each of a 

 single species in the Atlantic United States, which are 

 duplicated on the other side of the world, either in 

 identical or almost identical species, or in an analogous 

 species, while nothing else of the kind is known in any 

 other part of the world. 



I ought not to omit ginseng, the root so prized by 

 the Chinese, which they obtained from their northern 

 provinces and Mantchooria, and which is now known 

 to inhabit Corea and Northern Japan. The Jesuit 

 Fathers identified the plant in Canada and the Atlan- 

 tic States, brought over the Chinese name by which we 

 know it, and established the trade in it, which was for 

 many years most profitable. The exportation of gin- 

 seng to China probably has not yet entirely ceased. 



