The demand of yellow pine lor good drainage is everyvrhere evident 

 Douglas fir comes in wherever there is much moisture, sometimes 

 occurring with spruce as on the low etrearn "banlrs of Ditch Cree": 

 and Little Ditch Creel-::. Moisture conditions are undoubtedly 

 of great importance in determining the composition of the mix- 

 ture of Douglas fir and yello~r pine out the thrifty growth of 

 the species on the well watered c.nd well drained banl-s of ditches 

 as v/ell as on very dry south slopes would seem to indicate that 

 variation of moisture supply is less effective in limiting the 

 tjpe than is variation in sunlight. 

 ' - GBOU1ID C07SH 



The characteristic herbaceous ground cover of pure 

 stands is heavier than that ox mi::ed stands. Bunch grass, 

 lupine, small sunflower and printed cup are chezactistic 

 her os in the pure type and they are much less plentiful o:.- en- 

 tirely absent in mired stands, due to their demand for abundant 

 sunlight, line grass occurs in half-shaded places throughout 

 the I-orest. The mi;;ed stands usually have considerable brush, 

 notably alder, and willows. Huckleberry and snow drop are 

 common over most of the yellow pine country while ceanothus, 

 cherrj- and service berry occur in opening's and ninebarh, willow 

 alder, aspen, red dogwood, rose, elder and thorn follow the 

 streams and seeps. 



Cover probably e::erts no considerable influence over 

 reproduction e::ce_'t in barring entrance to the soil for the 

 seeds. Repeated enamploc might be cited, showing that both 



