312 Part III. Chapter 4. 
eastern arctic America shows that 281 are common to it, and that 38 are 
found in temperate, but not arctic eastern America’). 
The flora of arctic east America differs from that of the western part 
of the continent, in possessing more east American species. The western 
boundary is an artificial one, but the eastern is natural both botanically and 
geographically, for Baffın Bay and Davis Strait have very deep water and 
different floras on their opposite shores. The portion of this province richest in 
plants is the tract between the Coppermine and Mackenzie rivers. East of this : 
the number of plants rapidiy diminishes and also to the northward. The flora E 
of arctic east America consists according to HOOKER of 379 species. Of these 
379 species, 323 inhabit temperate North America, east of the Rocky mountains; E; 
35, the Cordilleras; and 49, temperate antarctic South America. Comparing 3 
this flora with that of Europe, it is found that 239 species are common to the a 
arctic regions of both continents, while but little more than one third of the e> 
arctic European species are arctic east American. Of 105 non-European species & 
in arctic east America, 32 are Asiatic; leaving 73 species confined to America, = 
Douglasia arctica and Pleuropogon Sabinii are the only plants ab 
solutely peculiar to arctic east America. Compared with Greenland, the flora 
of arctic east America is rich including many species not found in Greenland. 
The following are found on the arctic islands, and many of them on the west 
coast of Baffın Bay, but not in west und. : 
Caltha palustris L: Senecio frigidus Less. 
Parrya arctica R. Br. 
Arenaria (Merkia) physodes Fisch. 
Stellaria crassifolia Ehrh. 
Astragalus alpinus L. 
Oxytropis campestris D.C. 
> uralensis D.C. 
> nigrescens Fisch. 
Geum (Sieversia) Rossii Ser. 
Saxifraga hieracifolia Waldst. & Kit. 
» virginiensis Mich. 
Valeriana capitata Pall. 
Nardosmia corymbosa (= Petasites fri- 
gidus Fries) Hook. 
Chrysanthemum arcticum L. 
Artemisia vulgaris L. 
Salix phlebophylla Anderss. 
Lioydia serotina Sweet (— 
Glyceria fluitans R. Br. 
—. purgans L, (= 
L. alpina 
(Salisb.). 
B. ciliatus L.) 
ı) Hooker, J. D.: Ontlineg of the Distribution of arctic Plants. Transaction Linnean Socie 
1860, 
of London XXIII: 251-348, 
> palustris Hook. 
> pulchellus D.C. 
Solidago virga-aurea L. 2 
Aster salsuginosus Hook. (= A. per = 
Crepis nana Richards. [grinus Pursh). 
Saussurea alpina D.C. 
Andromeda polifolia L. 
Arctostaphylos alpina Spreng. 3 
almia glauca Ait. Be 
Phlox sibirica L. a 
Castilleja pallida Kunth. 
Pedicularis capitata Adams. 
> versicolor Wahlenb. (=P. 
Oederi Vahl). 
Androsace septentrionalis L. 
> Chamaejasme Willd. 
Hierochloe pauciflora R. Br. 
Pleuropogon Sabinii R. Br. 
Elymus mollis Trin. 
