developed, are to be found a number o1 herbaceous species which are 
rere Within our region. Examples of such are: Phlox Douglasii, 
Orthnocarpus tenuifolius, Physaria Geyeri, Trillium petiolatum, and 
Silene Scouleri. 
In dry open places and along rights-of way there also occur occasional 
entrants from the plains or Rocky Mountain floras which do not appear 
to be normal inhabitants of our region. Such are Monarda menthaefolia, 
Rhus Toxicodendron, Thalictrum purpurascens, Ribes aureum, Clecme ser- 
rulata and Astragalus tenellus. 
On the well-drained flats of the Kootenai valley Corylus rostrata ver. 
californica and Shepherdia canadensis are abundant. I have also found 
the latter occasionally in similar situations near Priest Lake but no- 
where else, although I am informed by Mr. J. H. Christ that it is con- 
mon on the north and west sides of Lake Pend Oreille. 
Juaging from the nature of its associates 4s well as from 
its own reactions, it seems not improbable that the Douglas fir-larch 
type represents an extension westward of the similar but extensive 
forests of northwestern Montana, which, because of edaphic factors, is 
aple to maintain itself vrecariously in restricted areas which ére un- 
Pavorable for yellow pine and at the same time unfavorable for the white 
pine type. As suggested by ir. J. H. Christ in a versonal communice- 
tion, it may represent an ecotone between the yellow pine end white 
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