STATISTICS OF METASPERMAE. 717 
The general parallelism between these tables and those of 
the generic range-elements need not be noted here in detail. 
As before, the largest figure is that which indicates the east- 
ern range-per cent. of the Monocotyledones. The even north 
and south range of the Monocotyledones is to be observed, 
together with the preponderant southward massing of the 
Metachlamydeae. The eastern and western percentages of 
Metachlamydeae are found to approach each other more 
closely than such percentages in the other two groups,—in- 
dicating as before, the comparative lateral solidarity of the 
Metachlamydeae, to be set over against the comparative 
longitudinal solidarity of the Monocotyledones. In both cases 
the Archichlamydeae are seen to occupy the intermediate 
position, As a whole the metaspermic flora of the Minnesota 
valley presents itself as distinctly eastern and southern by 
species as before by genera. The statistics are as follows: 
Total Northern...... 642 | Northern per cent. of all species.. 55.6 
Total Southern...... 892 | Southern per cent. of all species.. 76.1 
Total Eastern....... 1,022 |} Eastern per cent. of all species... 87.2 
Total Western....... 603 | Western per cent. of all species... 51.4 
It is possible, too, from Table D. to determine certain com- 
pound-ranges, both numerically and by percentages. Upon 
examining the table it will appear that the following groups 
may be isolated for study: 
(1) North-East Specitic Element. NE. 
(2) North-West Specific Element. NW. 
(3) North-East-West Specific Element. NEW. 
(4) North-South-West Specific Element. NSW. 
(5) North-South-East Specific Element. NSE. 
(6) North-South-East- West Specific Element. NSEW. 
(7) South-East Specific Element. SE. 
(8) South-West Specific Eiement. SW. 
(9) South-East-West Specific Element. SEW. 
