Preface. 



The material used for the following investigation is the pro- 

 perty of the Botanical Museum in Copenhagen. A large material 

 of Cornus suecica, preserved in spirit and collected at several 

 places in Greenland has been placed at my disposal, also a smaller 

 quantity of similar material from Finmark, other places in 

 Norway, from Sweden and Denmark. Besides this, I have used 

 dried material of Cornus suecica from Greenland, Iceland, the 

 Færoes, Denmark, Norway, Sweden, Finland and North America. 



Amongst the dried specimens from Greenland I found three 

 specimens of Cornus canadensis, determined as Cornus suecica ; 

 these specimens were collected by A. Jessen, July the 28th 1894. 

 on a small, remotely situated island, Inuarudgligak, near the 

 southern point of Greenland (60° 23"). Cornus canadensis has not 

 hitherto been known to exist in Greenland; certainly W. Meehan 

 mentions it as found here, but Th. Holm, who has gone through his 

 material from Greenland, has shown, that Meehan was probably not 

 in position to determine his plants correctly, especially as he has 

 not even collected the plant, but simply made a note of its 

 occurrence. I have also had ample material of Cornus canadensis 

 from North America and Japan. 



Fig. 2 is drawn by Professor Warming ; the photograph fig. 10 

 is taken by H. E. Petersen, mag. sc, while the remaining figures 

 are drawn by myself. 



XXXVII. 



