Alpine and Arctic Floras 



seem to be descended either from L. abyssinica or its 

 parent form. 



It is exceedingly hard to understand how the seeds 

 of these plants skipped the gaps between the mountains 

 of Europe to Abyssinia, then to Ruwenzori, and thence 

 to Mt. Kilimanjaro. 



Could a gale of wind blow seeds over such inter- 

 vals ? On the whole it seems more probable that 

 birds who range over enormous distances in their 

 annual migration must have given Luzula the oppor- 

 tunity of spreading from the North of Europe to far 

 south of the Equator. 



1 Schimper. ^ vVulff, Tansley. ^ Thorold, Hemsley. 



* Radde. ^ Kirchner. « Sewell. 



' Buchanan White. ^ Adamovic. * Engler. 



98 



