GLEASON AND MCFARLAND: INTRODUCED VEGETATION 513 
The total number of introduced species is then apparently 
‘I20, or 18 per cent. of the total flora. This corresponds very 
closely to the proportion for the whole Manual range, which is 19 
per cent., according to the tabulaticn in the seventh edition of the 
Manual. The systematic distribution of the 120 species is quite 
interesting, and differs markedly from that of the introduced flora 
of the whole Manual range. Among them are 24 composites, 
16 grasses, 10 mints, 10 legumes, 9 mustards, 9 pinks, and 8 
polygonads. These seven families include therefore nearly three 
quarters of the whole. The first two families contribute also 
about 76 native species to the flora of the region, but the last five 
are represented here chiefly by their 46 introduced species, and 
have but 31 native members in the known flora. For each of 
these seven families, the proportion of introduced species is con- 
siderably in excess of the general proportion for the Manual range. 
Of the pinks, 87 per cent. are introduced, compared with 47 per 
cent. in the Manual range, while for the other families the propor- 
tions are for the legumes 78 per cent., crucifers 53 per cent., poly- 
gonads 53 per cent., mints 47 per cent., composites 36 per cent., 
and grasses 34 per cent., compared with 20 per cent., 45 per cent., 
24 per cent.,35 per cent., 17 per cent., and 17 per cent., respectively, 
for the Manual region as a whole. No definite reason can be 
assigned for the unusually large proportion of introduced species 
in these particular families, but it may be possible that the 
Douglas Lake region lies too far north for most of the native 
species, 
Of these 120 species, a considerable number have been found 
only in the immediate vicinity of civilization and at a considerable 
distance from Douglas Lake. The railroad tracks and vacant 
lots at Pellston have furnished a number, and several more species 
have escaped from cultivation in the thickly settled neighborhoods 
east of the lake. These plants have shown no tendency to estab- 
lish themselves in the uncultivated region, or to follow the progress 
of civilization into it, and will accordingly receive no further 
attention in this paper. 
For convenience, the introduced flora will be considered under 
three heads, that of summer resorts, of roads and clearings in the 
hardwoods, and of roads and clearings in the aspen land. 
