i he subject-matter of the present paper has been worked out 

 in the Botanical Laboratoi-y in Copenhagen and my thanks are due 

 to Professor Warming for his great kindness in giving me advice 

 and help. I have used his notes of his Arctic journeys, and I am 

 indebted to him for most of the flower-biology drawings and some 

 others. As regards the remaining figures, the anatomical ones have 

 been drawn by me and most of the morphological ones have been 

 drawn under my supervision. The spirit-collection of Ranunculaceœ 

 belonging to the museums of Copenhagen and Stockholm, in which 

 most of the species are richly represented, were freely placed at 

 my disposal and for this I wish to express my gratitude to the 

 Directors of the museums, Professor Warming and Professor Lindman. 

 I have also been kindly permitted to use the Arctic herbarium 

 belonging to the Botanical Museum in Copenhagen. In addition I 

 wish to express my thanks to the Inspector of the Museum, Dr. phil. 

 С H. OsTKNFELD, for the kind help I have several times received 

 from him. 



The following species have been investigated : — 



Anemone Richardsoni p. 414 



Batrachium confervoides p. 410 



Coptis trifolia p. 426 



Ranunculus acer p. 354 



— affinis p. 349 



— glacialis p. 338 



— hyperboreus p. 392 



— lapponiciis p. 397 



— nivalis p. 373 



— Pallasii p. 404 



— pyffff^fj^i^s p. 380" 



— reptans p. 387 



— sulphureus p. 364 



Thalietrum alpinum p. 419 



22» 



