458 



lions concerning the places, where future investigations on 

 this point may be carried out with the greatest advantage. I 

 naturally intend to investigate also this point in the future, but 

 I am fully aware that it is impossible for me to do this 

 thoroughly, unless others cooperate with me in the elucidation 

 of the question. 



I therefore communicate my results as quite premilinary : 



Greenland. 

 In the fairly rich material from different places in West, 

 East and South Greenland all the specimens seem to belong to 

 the arctic type. (Dried and spirit material). (Fig. 2, ^ & Fig. 5.) 



North America. 

 From this country I have had but two plants for investi- 

 gation, therefore I cannot draw the line here. (1.) Labrador, 

 specification wanting, arctic type. (2.) Quebec, Gaspé County, 

 River St. Anne des Monts, August, temperate type. (Dried 

 material.) 



Iceland. 



Eastern Iceland. Vallanes (Fig. 6) arctic type. 



» n Seydisfjordur, July » » 



Northern » Helgavatn. June » » ? 



» » Husavik. June >> » ? 



» » Øfjord. Akureyri, June ... » »? 



North-western 



Iceland. Dyrefjord, July temperate » 



Western » Reykjavik » » 



Southern » Westmanna-Islands, July. . » » 



1) » Hjørleifshøfdi, July » » 



» I) L4fsvatn, Tvidægra, 500 m. 



above sea-level. July . . arctic » 



This material is collected mainly in June or July, a season 

 of the year, in which it is difficult to decide, whether an 



