36 IP s t e I 5 i a 



Boykinia data Trientalis curopaca arctica 



L'ninaca horcalis 

 These are most abundant where consider- 

 able moisture is present in the soil. The salal 

 bushes along the edge are not as large and vig- 

 orous as those farther back since along the bor- 

 der of a formation or society are always to be 

 found the less ty])ically develo])ed ])lants. In 

 the middle region the salal assumes its character- 

 teristic growth and size (Pl.V.) and the in- 

 extricable tangle is here shown at its best. The 

 stems which do not grow upright, l)ranch freely 

 in all directions and these intertwine in every 

 conceivable way making passage through prac- 

 tically impossible. The matted manner of 

 growth which the plant assumes along the forest 

 edge is partly due to the fact that in this position 

 it is exposed to the full impact of the winds and 

 subjected to sea influences. Where it is not so 

 exposed it has a much more open growth as is 

 characteristically shown in well protected places 

 and where, as it enters the forest proper, it thins 

 out gradually. In this dense growth a few 

 plants which evidently are willing to accept the 



