Dec. 1901.] BOTANICAL SOCIETY OF EDINBURGH 109 



be found that the two great " predisposing causes," as 

 physicians would say, are in this case the use of 

 imperfectly seasoned timber, and the enclosing of timbers 

 where good ventilation is impossible. 



The riiANEROGAxMic Flora of the Clova Mountains 

 IN special relation to Flower Biology. By J. C. 

 Willis, M.A., and J. H. Burkill, M.A. 



(Read 12th December 1901.) 



The present paper enumerates the Phanerogamic Flora 

 of CTova, classifies the species in it by their flower biology, 

 and gives our own observations upon their distribution in 

 altitude and time of flowering. Our purpose is to trace 

 any connection which may exist between the flower 

 biology and the two latter attributes. 



To us the Clova region means strictly the southern face 



of the Grampians within convenient distance of Milton of 



Clova, i.e. Glen Clova above Dykehead, Glen Prosen above 



Inchmill, and the moors of the Xorth Esk above Loch Lee. 



The whole area approximately comprises — ^ 



Above 3000 feet, oue-third square mile. 

 2500-3000 feet, 20 square miles. 

 2000-2500 „ 28 

 1500-2000 ,,18 „ ' 



1000-1500 „ 28 „ 



500-1000 „ 9 „ 



It consists of three conditions — the valley bottoms or 



straths, the hillsides with their crags, and the peaty moors. 



The latter begin at 2500-2600 feet. 



82 Phanerogams grow on the moors, 4 being confined to them. 

 263 „ ., hillsides, 35 



298 ,, ,, straths, 97 „ „ 



The total number of self-maintaining Phanerogams is 

 363 ; there are also 16 others maintained by man through 

 agriculture or arboriculture, and these are distinguished in 

 the list which follows by wanting the consecutive number- 

 ing, and by inclusion at the same time in brackets. 



Of the 363 self-maintaining Phanerogams, 81 are to be 

 reckoned as alpines, and 282 as lowland plants. AH the 



