30 



D. N. McVEAN 



Fig. 3. Histograms 6 + 7 and 1 -f 2 show the different size distributions 

 in north and south respectively, and H 1-7 is a summation of all populations. 



The Sutherland populations are also significantly less variable than those of S.E. 

 England. 



The New Forest populations of Matley and Holmesley Bogs are anomalous (see 

 discussion). 



Leaf and catkin measurements were also made over an altitudinal range of 1300 ft. 

 (397 m.) in W. Inverness-shire (Table 3), but no variation with altitude was detected. 



Table 3 



Altitudinal variation in leaf and catkin size 







Ivlean 



Mean 



Locality 



Altitude 



Leaf size 



Catkin size 





(m. O.D.) 



(mm.) 



(mm.) 



Loch Treig 



260 



52-5 X 46-3 



8-5 X 8 0 



Loch Treig 



351 



51-4 X 51-9 



7-9 X 7-9 



Loch Treig 



460 



58-6 X 52-4 



8-9 X 8-1 



Glen Nevis 



61 



59-8 X 55-5 



101 X 7-7 



Glen Nevis 



275 



66-9 X 65-2 



9-3 X 7-9 



