- PAPERS ON BOTANY 127 
of way. The opposites of these influences would favor develop- 
ment into forest. 
The ruderal plants are in too many places able to get in and 
successful in establishing themselves, forming pure weed 
growths or ruderal components in forest or prairie. 
The forest clearings most likely to be successfully revegetated 
by prairie plants are those to the west of streams, since there 
the prairie is better preserved, and the forest fringe is nar- 
rower and broken. The right of way approaches a stream on a 
down grade through broken country dissected by ravines. In 
CULTIVATED UPLAND 
—_ PASTURED s 
f )\ 222 100 FLOOD-PLAIN 
f SCALE IN FEET Re ae 
most places the original boundary between prairie and forest 
on the west side of streams was at or near the edge of the flat 
upland, but there were usually tongues or islands of prairie even 
in the broken country near the stream, within the general for- 
est area. These have spread into the rights of way, occupying 
them almost continuously from the prairie upland to the end 
of the embankment which runs to or part way over the flood- 
plain, thus making a narrow lane of prairie through the forest. 
In a few places it appears that prairie vegetation is established 
on the east side of the stream as well. 
