288 
Matthews.—The Distribution of certain 
concentrated in the Channel area is shown in Diagram 5. Seventeen of 
these are found in the Peninsula, 13 in the Thames, and 9 reach the Ouse 
district. Finally, in Diagram 6 there is shown the distribution of the 41 
Diagram 3. Distribution of 37 1 Ouse ’ species. 
species which have their head-quarters in the Peninsula. Of these 17 are 
common to the Channel, only 7 reach the Thames, and 7 also appear in the 
Ouse province. 
These facts are summarized in Table II. Since 30 of the 129 rare 
species do not occur in the districts defined, the total flora of the four areas 
combined numbers 99 species. 
