224 HOOKER ON ARCTIC PLANTS. 



The great differences between the proportions of largest Orders 

 to the whole Flora show how little confidence can be placed in 

 conclusions drawn from local floras. Ericece is the only order 

 which is more numerous proportionally to other plants in every 

 province than in the entire Arctic flora, and Cruciferce is the only 

 one that approaches it in this respect ; and Legurninosce is the 

 only one which is less numerous proportionally in them all. 

 East and West America agree most closely of any two provinces ; 

 then (excluding LeguminoscB) all Greenland and Europe ; next 

 Arctic Greenland and all Greenland. The greatest differences 

 are between Arctic Europe and Asia, and Arctic Asia and West 

 America; they are less between Arctic Greenland and Asia 

 (excluding LeguminoscB) ; they are great between Arctic Green- 

 land and East America ; and as great between all Greenland and 

 Arctic America. 



The proportion formerly deducted by Brown, and others for 

 the high Arctic regions was a much smaller one ; the Monocotyle- 

 dons being in comparison with the Dicotyledons 1:5; and this 

 still holds for some isolated, very Arctic localities, as North-east 

 Greenland; whereas Spitzbergen presents the same proportion 

 as all the Arctic regions, 1 : 2*7; the Parry Islands 1 : 2*3 ; 

 the west coast of Baffin's Bay, from Pond's Bay to Home Bay, 

 1 : 3*3 ; and the extreme Arctic plants mentioned at p. 205,1 : 3. 

 Of the prevalent Arctic plants mentioned at p. 203-4 the proportion 

 is 1 : 3*4. I have dwelt more at length on these numerical pro- 

 portions than their slight importance seems to require ; my object 

 being to show how little mutual dependence there is amongst the 

 Arctic florulas. Each has profited but little through contiguity 

 with its co-terminous districts, though all bear the impress of 

 being members of one northern flora. 



VI. — On the Grouping of Forms, Varieties, and Species 

 OF Arctic Plants for the Purposes of Comparative 

 Study. Pages 276-281. [Not reprinted.] 



VII. — Tabulated View of Arctic Flowering Plants, and 

 Ferns, with their Distribution. Pages 281-309. [Ab- 

 stract of two columns here given, with some additions.] 



[Two columns only of the original table are here abstracted ; one for 

 *' Arctic-Eastern America," and another for " Greenland." A few additions to 

 these have been made by the Author from various Expeditions and other 

 sources of information since I860.] 



The Arctic Flowering Plants and Ferns indicated by the follow- 

 ing table are — 1. Those from East Arctic America (" EA or M "), 

 from Mackenzie River to Baffin's Bay : the " M " signifies that 

 the plant extends to the islands north of Lancaster Sound, and to 

 the Parry Islands, including Melville Island, the best explored of 

 them. 2. Those from Arctic Greenland (" G," " S," " E," *' Ss," 

 or " NE ") : the " S " indicates that the species has been found 



