LIST OF INTRODUCED PLANTS & CASUALS 
OBSERVED IN N.E, SCOTLAND, ESPECIALLY IN “DEE,” 
By Pror. JAMES W. H. TRAII.. 
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‘My original intention in making up the following list was merely 
to put together the results of personal records, made either person- 
ally during botanical excursions during a good many years, or from 
the examination of various collections that have passed through my 
hands for verification, with a view to supplement the additions and 
«corrections recorded in the preceding paper by Mr. Roy and myself. 
-As the work progressed it seemed to me advisable to modify the 
-design and to include all the casuals. of whose occurrence in the 
district I could find a reliable record. JDickie’s ‘‘ Botanist’s Guide 
to the Counties of Aberdeen, Banff and Kincardine” has been the 
-chief source of information, apart from my: personal observations : 
‘but in respect to certain plants I have found myself compelled to 
differ from his conclusions as regards their claim to be in- 
ea cluded: among indigenous species in this part of Scotland. It 
must, however, be remembered that such questions are by the 
very nature of the case very hard to decide beyond dispute. There 
is good reason to believe that many species admitted without 
controversy or mark of doubt into the British floras were origin- 
ally introduced, undesignedly, by man. Very patent instances are 
met with among the weeds of cultivated ground, such as poppies, 
‘some spurges, several speedwells, and others too numerous to 
_ specify. Certain other plants may hardly be considered weeds of 
cultivated ground, yet are seldom, if ever, seen at a distance from 
human habitations, and delight especially to grow on ruins or on 
ground rich in nitrogenous substances, the result of human 
occupancy of the ground, ¢.g., on dung-stances. Nettles, the 
goose-foots and oraches, and various others belong to this group. 
