STATISTICS OF METASPERMAE. 749 
Upon comparing the preceding table with the general tables 
of specific range on pp. 715-716, a number of instructive 
points will be discovered. 
The trees of the Minnesota valley are much more distinctively 
southern than the general population. They are also much 
more distinctively eastern. This is readily noted by comparing 
the per cents of totals, for each element of range, in the gen- 
eraland the special tables. This southernness and easternness 
is more marked in the case of the metachlamydeous trees than 
of the archichlamydeous, but in either is in excess of the 
southern and eastern per cents of the total taxonomic groups. 
Conversely, the trees are decidedly less northern in their char- 
acter than the general population. The Archichlamydee are, 
however, more northern than the Metachlamydeas. Of the 
metachlamydeous trees aslightly larger percentage show the 
western range than of the archichlamydeous trees. This is 
due to the general lateral solidarity which has been pointed out 
as a characteristic of the Metachlamydee. 
The shrubs of the Minnesota valley present opposite range 
characters, in comparison with the trees. They are more dis- 
tinctly northern than southern and the northernness is in ex- 
cess over that of the general population while the southernness 
is considerably less. Between the eastern and western per cents 
of the shrubby element and of the whole element there is less 
difference, but the shrubs are a trifle more eastern in character 
than the general flora. Thenorthernness of the metachlamyde- 
ous shrubs is more pronounced than the northernness of the 
archichlamydeous shrubs, while the metachlamydeous shrubs 
are both more eastern and more western than the archichlamy- 
deous. This, again, is a result of metachlamydeous lateral 
solidarity. The strong northernness of metachlamydeous 
shrubs is the most remarkable feature of shrub distribution in 
the valley of the Minnesota. It may perhaps be attributed to 
the influence of thé tensions upon habit. The shrubby habit 
might be expected to emerge more strongly farthest from the 
Central region. 
The herbs of the valley are distributed very much like the 
general element. The differences between the trees and shrubs 
serve to neutralise each other ana the residuum is only slightly 
more northern, southern and western and only slightly less 
eastern than the total flora. 
