624 METASPERMAE OF THE MINNESOTA VALLEY 
widely dispersed over both distal and central regions. Mono- 
cotyledones and Metachlamydeae, therefore, characterise the 
central family-element of the Minnesota valley, and Monoco- 
tyledones and Archichlamydeae the distal family-element of the 
valley. This seems to be the most useful generalisation that 
can be made from the statistics of families. 
Il. EXAMINATION OF GENERA REPRESENTED IN THE 
MINNESOTA VALLEY. 
The total number of genera represented in the valley of the 
Minnesota is 407. Of these 105 or 25.8 per cent. are monoco- 
tyledonous; 174 or 42.7 per cent. are archichlamydeous; and 128 
or 31.2 per cent. are metachlamydeous. The following table 
presents these points in acondensed form. 
4. Representation of Genera. 
Perct.ofallj|Average no. of 
No. of gen. gen.inval.| gen. per family. 
Monocotyledones .... ...... 105 25.8 5.00 
Archichlamydeae.... ...... 174 42.7 2.90 
Metachlamydeae............ 128 31.2 5.12 
Total no. of genera...... 407 » a Gen. average no. 
per family, 3 84. 
B. Table Lilustrating the Distinctive Range of 
TROPICAL AND 
COSMOPOLITAN, EXTRATROPICAL. SUBTRUPICAL. 
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INAS adie aceniae se idessey aealesen cis 
PO VISTVA 2s fois paren seraie aia anes 
Sagittaria 
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