Statistics of the Flora of the Northern States. 369 
Art. XXXVIL.—Statistics of the Flora of the Northern United 
States; by Asa GRAY. 
[Continued from p, 84.] 
ALTHOUGH such details as, I have to present are far from in- 
Viting to general readers; it is desirable to put them upon record, 
Inasmuch as the facts they bring to view are useful to those phi- 
losophical naturalists who are discussing important problems re- 
specting the present distribution of plants and animals over the 
world, and the causes which have determined the present state 
of things. This must be,my excuse for continuing at such a 
length the present series of articles. 
compared our flora with that of Europe in respect to 
Having ect to 
closely allied species, it may be interesting to institute a similar 
comparison with that of Oregon and Northern California. The 
comparison might also be extended to Northwestern Asia, and es- 
crm to Japan, with which we have peculiarly interesting re- 
ations as to species; but this is better deferred until some recent 
collections from the northern part of Japan have been completely 
examined. 
Comparison of the Flora of the Northern United States with that 
of the Pacific coast of North America (Oregon and North 
California) between lat. 46° and lat. 36°. 
1. As to Geographical Varieties, 
The following have been distinguished as species by excellent 
botanists, but in most cases, perhaps in all, they should rather 
be considered geographical varieties. 
Natives of ‘ egon and California, 
Natives of Eastern N. U. 8. at, 46°~36°. 
Trautvetteria palmata, T. grandis, Nutt. 
Aquilegia Canadensis, A. formosa, Fisch. 
Actzea spicata, A. arguta, Vuit. ‘ 
Erysimum Arkansanum, E. asperum and elatum, Vutt, 
Honkenya peploides, H. oblongifolia, Zorr.d Gr. 
Stellaria borealis, S. erispa, ne 
Euonymos atropurpureus, E. occidentalis, Nutt. 
Negundo aceroides, - N, Californieum, Torr. & Gr. * 
Vicia Americana, V. Oregana, mf me ws 
us Canadensi A. 0 EF Og : 
Spircea opulifolia, za S. capitata, Pursh, S. pauciflora, Nutt. 
“ _ Arunecus  §. acuminata, Dougl. oe 
Pp, ‘ a : P. Hippiana, pulcherrima, bipinnati- 
otentilla Pennsylvanica, fida, &e. 
Rubus Nutkanus (parvifiorus, : 
a (p R. Nutkanus, 
SECOND SERIES, VOL, XXIII, NO. 69.—MAY, 1857. 
47 
