1868.] 



HOOKER — ARCTIC FLORA. 



355 



whole of Greenland is comparatively poorer in species than Arctic 

 Greenland is. 



Gen. Sp. Ord. Sp. Gen. Sp. Ord. Sp. 



Arctic Scandinavia .. i : 2.3 — 1 : 9*6 Arctic Greenland 1 : 2.0 — 1 : 5.5 



All Scandinavia 1 : 2.8 — 1 : 11.6 All Greenland 1 : 2.3 — 1 : 6.6 



The proportions of Monocotyledons to Dicotyledons are: — 



Arctic Flora 



" Europe 



" Asia 



" West America. 



2.6 

 2.3 

 4-5 

 3-8 



Arctic East America. 



" Greenland 

 All Greenland 



2.1 

 2.0 



THE PROPORTION OF LARGEST ORDERS TO THE WHOLE FLORA. 



The great differences between these proportions show how little 

 confidence can be placed in conclusions drawn from local floras. 

 Ericeas is the only order which is more numerous proportionally 

 to other plants in every province than in the entire arctic flora, 

 and Cruciferae is the only one that approaches it in this respect ; 

 and Leguminosae 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 Leguniinosse) 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 Leguminosaa) ; they are 

 great between Arctic Greenland and East America ; and as great 

 between all Greenland and Arctic America. 



