588 SEQUOIA AND ITS HISTORY. 
= Our yellow-wood (Cladrastis) inhabits a very limited district 
on the western slope of the Alleghanies. Its only and very near 
relative, Maackia, is in Mandchuria. } 
The Hydrangeas have some species in our Alleghany region; all 
the rest belong to the Chino-Japanese region and its continuation 
westward. The same may be said of Philadelphus, except that 
there are one or two mostly very similar species in California and 
Oregon. 
Our blue cohosh (Caulophyllum) is confined to the woods of 
the Atlantic States, but has lately been discovered in Japan. A 
peculiar relative of it, Diphylleia, confined to the higher Allegha- 
nies, is also repeated in Japan, with a slight difference, 80 that it 
may barely be distinguished as another species. Another relative 
is our twin-leaf (Jeffersonia) of the Alleghany region alone; & 
- second species has lately turned up in Mandchuria. A relative of 
this is Podophyllum, our mandrake, a common inhabitant of the 
Atlantic United States, but found nowhere else. There 1s ee 
other species of it, and that is in the Himalayas. Here ny e 
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 ip z 
analogous species, while nothing else of the kind is known i any 
other part of the world. pp 
I ought not to omit ginseng, the root so prized by the et 
which they obtained from their northern provinces and yE 
chutia, and which is now known to inhabit Corea and Norther 
Japan. The Jesuit Fathers identified the plant in Canada oa 
Atlantic States, brought over the Chinese name by which we 
it, and established the trade in it, which was for many Y°"* — 
: : . "hi robably has not 
profitable. The exportation of ginseng to China p 
yet entirely ceased. Whether the Asiatic and the sib 
American ginsengs are exactly of the same species or pe pi 
what uncertain, but they are hardly, if at all, distinguishab E 
There is a shrub, Elliottia, which is so rare and local tha)! 
known only at two stations on the Savannah River, 1P. ai 
It is of peculiar structure, and was without near. relative 
me itas 
one was lately discovered in Japan (Tripetaleia), "a the 
hardly to be distinguishable except by having the ae g pot 
blossom in threes instead of fours,—a difference a 
: A pies. 
uncommon in the same genus, or even In the same spec 
and the 
ears most 
Atlanti¢ : 
itis 
