PHYTOGEOGRAPHY OF GREENLAND 



289 



area (particularly the pocket at the head of Sondre Stromfjord) include not 

 only many helo- and hydrophytes, e.g. Potamogeton gramineus, Scirpus 

 pauciflorus, Jwicus alpinus, J. ranarius, but also a species like Arctostaphylos 

 uia-wsi (American variety). These southern species are with few exceptions 

 absent from east Greenland but occur — again with few exceptions — in the 

 interior of south Greenland. 



Fig. 3. On the left: western limits for a number of Continental species in middle 



west Greenland. On the right: one of the most important members of this group: 



Caiex supina ssp. spaniocarpa. (From Bocher, 1963.) 



In middle east Greenland almost the same species as shown in Fig. I (on 

 the left) are found northwards up to the boundary on the Blosseville Coast or 

 in the northern part of the Angmagssalik district. Many of the Arctic species 

 occur north of these limits and inland at Kangerdlugssuaq (68° 10'-68'' 30') 

 or inland at Angmagssahk (Bocher, 1938). 



Calculations of the percentage occurrence of distributional types in a 

 number of local floras in middle west Greenland are summarized in Fig. 2 

 (on the right). The most important groups of distributional types, viz. the 

 Arctic, the Continental, and the Oceanic-sylvicolous, are shown. Only north 

 of line 10 in Fig. 2 (on the left) and not south of Disko Bay are there floras 

 with a majority of Arctic species. Middle west Greenland constitutes a 

 transitional zone between a flora which is Arctic (Low-medium Arctic) and a 

 flora which greatly approaches a Boreal one. The lack of forest in southwest 



