Rosaceæ. 47 



The flowering period is June-September. Flowers from Bose- 

 kop (Arct. Norway) were found to be distinctly proterandrous; 

 the next stage is homogamous, and it is probable that self- 

 pollination takes place in the latter, as the outermost of the 

 somewhat outwardly directed stigmas are either in direct 

 contact with the inner erect or slightly inwardly bent anthers, 

 or they are only slightly separated from these inner anthers 

 which occur either at the same level as the stigmas or at a 

 somewhat higher one. Herman Midler investigated a Pot. 

 cerna L 1 in the Alps in which he found the anthers developed 

 simultaneously with the stigmas. He writes that as the 

 flowers in inclement weather remain half-closed and during 

 the night entirely closed, self-pollination is ensured if cross- 

 pollination fails. 



The fruit does not ripen in the mountains of northern 

 Sweden (Gleve). 



Potentilla anserina L. 



Lit. Warming, 1884. Knutö, 1894. Norman, 1895. 

 Coville, 1896. Porsild, 1902. Poppius, 1903. Sylvén, 

 1906. Wolf, 1908. 



As regards the distribution of this species in Arctic Nor- 

 way Norman writes that the strand and the fore-shore were 

 most likely its original habitats and as the result of civi- 

 lization it has been brought inland where it occurs especially 

 along road-sides and near houses. This supposition is no 

 doubt true for other regions also; thus Coville (I. c.) records 

 that in Yakutat-bay in Alaska where Pot. anserina is common 

 it is confined to the beaches. On Disco Porsild found var. 

 Egedii in such places only, where it would be washed by the 

 sea. Both Norman and Wolf think that P. anserina is 

 dispersed by the agency of the sea, and the latter author 

 writes that the fruit or even whole shoots ("ganze Stöcke") 



1 It is uncertain whether this was a P. maculata or a P. minor Gil. 



