640 RELATION TO ENVIRONMENT. 



(4) Atlantic North American Region. 



(a) Appalachian province. (The forest district of the Atlantic 

 North American region south of the lake province includes three 

 zones: I, Alleghany zone, characterized by Pinus inops, Pinus pun- 

 gens, Pinus rigida, Picea fraseri, Juniperus virginiana; II, Carolina 

 zone, including New Jersey, Delaware, Maryland, Pennsylvania, Vir- 

 ginia, Georgia; III, Mississippi zone, including the forest district of 

 the Mississippi valley.) 



(>) Prairie province. (The western central and central prairies of the 

 Atlantic drainage, including also the Saskatchewan and Assiniboian 

 prairies of Arctic Ocean drainage.) 



1130. According to Drude. This is one of the most recent and general- 

 ized divisions of the earth into botanical realms and regions, and is used by 

 MacMillan, Pound and Clements, and others. 



THE FLORAL REGIONS OF CONTINENTS AND ISLANDS. 



Realms. Regions. 



(1) Arctic region. 



(2) Northern region. 



A. Northern Realm. 



(3) Middle Norh American region. 



(4) Mediterranean-Oriental region. 



(5) Lower Asian region. 

 . (6) East Asian region. 



(1) Tropical American region. 



(2) Tropical African region. 



B. Tropical Realm , N T ,. 



(3) Indian region. 



(4) Malayan-New Zealand region. 



(1) Andes region. 



(2) South African region. 



C. Southern Realm , x . L ,. 



(3) Australian region. 



(4) Antarctic region. 



THE FLORAL REGIONS OF THE OCEAN. 



Only one realm in the ocean is recognized. 

 The regions are as follows: 



A. Northern. B. Tropical. 



1. Arctic coasts. 4. Mediterranean coasts. 



2. North Atlantic coasts. 5. Tropical Atlantic coasts. 



3. North Pacific coasts. 6. Indian coasts. 



7. Tropical-Pacific coasts. 

 C. Southern. 



8. Australian coasts. 



9. Antarctic coasts. 



