Notes on migratory Plants 
By E. J. Hip 
It is always instructive to study the incoming and habits of 
introduced plants. This is especially true of those that have be- 
come troublesome weeds or may be such if the conditions favor 
their development. Some of those to be mentioned may be tran- 
sient visitors, or if persistent, harmless or acceptable additions to 
the indigenous flora; others are of a very different character. 
Those are chiefly noticed which have proved of the most interest, 
and the list does not claim to be complete. Chicago being $0 
great a railroad center, where cars loaded with grain and stock 
come from so many places to the westward, and from which dump 
is taken to outlying districts, provides a region with added facilities 
for the appearance of foreign plants. Among harmless kinds are 
the following : 
CONVALLARIA MAJALIS, L. In the spring of 1899 this was found 
in the dune region near Miller, Ind. The conditions were such 
as would have led to the conclusion that it was indigenous had 
I not frequently been in the locality for several years before, OF 
had found it more abundantly. It was remote from any dwell- 
ing where such a plant might be cultivated, in a hollow among the 
sand hills. Iwas looking for Cypripedium acaule which grows ' 
the locality in just such depressions, and was surprised to find in 
one of these, hidden among the jackpines, the lily of the valley. 
The plants were beginning to bloom, it being the middle of May- 
In such locations the sands are somewhat moist and the gt ound 
considerably shaded. The plant most abundantly associated with 
it was VMaianthemum Canadense, and the Convallaria was as much 
at home and seemed as flourishing as these. It would be a pur 
zle to tell how it came to so wild and little-frequented 4 spot if 
introduced, as I suppose it must have been. : 
Cassia Tora L. This was obtained the same season beside 
a railroad track at Barrington, Ill., about thirty miles north of 
Chicago. This is quite a distance north of its ordinary range- 
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The « 
saceseitlcnccacana 
