190 _ Prof. Gray on the Botany of = 
adjacent; one is “8 ei to our northwest coast and Japan ; 
cepted) to the Atlantic United States and Japan. Add to these 
the similar cases of other American pone (nearly all of them 
eculiarly Atlantic-American) which have been detected in the 
Fimal or in Northern Asia,—such as Sree oe 
dense Des 
demands ai planati io 
might be made yet stronger by reckoning some 
subgeneric types as equivalent to generic in the present view, 
and by distinguishing those species or genera which barely enter 
oe eastern borders of Europe; e. g. avi de a Mehringa 
teriflora, Geum strictum, ‘treed salicifolia, & 
“i will be yet more strengthened, and the Shiv tis conclusion 
ill become irresistible, when we take the nearly allied, as well 
as the identical, species into account. And also when we con- 
sider that, after excluding the identical aah Sth 15 per cent 
of the entries in the European column of the detailed tabular 
view are in italic type (i. e. are closely idtiaBersticon oe Japanese 
species); while there are 22 per cent of this character in the 
American column. 
For the latter, I need only advert to some instances of such 
close representation, as of 
Trollius patulus by T. Americanus, 
Aquilegia Burgeriana ze A. Ca octiagas 
Rhus vernicifera & R. venena 
Celastras scandens - oe becca 
Negundo cissifolium - NV. aceroides, 
Sophora Japonica . S. affinis, 
Sanquisorba tenuifolia . S. Ce 
Astilbe Thunbergii & Japonica = A, decandra, 
Mitchella undulata - 
Hamamelis Japonica . H. otis 
Cle inervis 24 C. acuminata, 
Rododendron brachycarpum sh Z Canpbiaies 
Amsonia elliptica = Tabernemontana, 
ururus 4 * S. cernuus, 
and many others of the same sort,—several of which, when 
better known, may yet prove to be conspecific; while an equally 
