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. 2 Wulff, Tansley. 3 Thorold, Hemsley. 
4 Radde. 5 Kirchner. ® Sewell. 
7 Buchanan White. ® Adamovic, ® Engler. 
98 
