HOOKER ON ARCTIC PLANTS. 215 



Arctic islands, is perhaps the poorest of any part of the area, those 

 of Banks' Land and Melville Island to the N.W. being consider- 

 ably richer, as are those of the shores of Lancaster's Sound and 

 Barrow's Strait, and the shores of Baffin's Bay to the north and 

 east.* 



The phsenogamic flora of Arctic East America contains 379 

 species. 



Monocotyledons - - 92 1 _ , „ . i 

 Dicotyledons - - - 287 / ~ * "^ ^* 

 The proportion of genera to species is 1:2*0; of these 379 

 species, 323 inhabit temperate North America, east of the Rocky 

 Mountains ; 35 the Cordillera ; and 49 Temperate or Antarctic 

 South America. Comparing this flora with that of Europe, I 

 find that 239 species (or two thirds) are common to the Arctic 

 regions of both continents, whilst but little more than one third 

 "of the 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, of which the 

 following are furthermore confined to the eastward of the Rocky 

 Mountains and Mackenzie River : — 

 Corydalis glauca. Vaccinium Canadense. 



Sarracenia purpurea. Dracocephalum parviflorum. 



Viola cucullata. Douglasia arctica. 



Silehe Pennsylvanica. Elaeagnus argentea. 



Arenaria Michauxii. Urtica dioica. 



Polygala Senega. Salix cordata. 



Lathyrus ochroleucus. Populus tremuloides. 



Rubus triflorus. Picea nigra. 



Prunus Virginiana. Spiranthes gracilis. 



Heuchera Richardsonii. Crypripedium acaule. 



Cornus stolonifera. Carex oligosperma. 



Grindelia squarrosa. Pleuropogon Sabini. 



Of these, Douglasia and Pleuropogon are the only ones abso- 

 lutely peculiar to Arctic East America. It is a noticeable fact 

 that not one of them is found in any part of Greenland. Com- 

 pared with Greenland, the Arctic-East -American flora is rich, 

 containing, besides those just enumerated, no less than 165 other 

 species not found in Greenland, The following are found on the 

 Arctic islands, and many on the west coast of Baffin's Bay, but 

 not in West Greenland : — 



Caltha palustris. Oxytropis nigrescens. 

 Parrya Arctica. Sieversia Rossii. 

 Merkia physodes. Saxifraga hieracifolia. 

 Stellaria crassifolia. S. Virginiensis. 

 Astralagus alpinus. S. Hirculus (East Greenland 

 Oxytropis campestris. only). 

 0. Uralensis. Valeriana capitata. ' 



* Details of these florulas will be found in the 5th volume of the " Linnean 

 ** Journal," under the notice of Dr. Walker's Collections made during the 

 Voyage of the " Fox." ^ 



