Portions of the British Flora. 
289 
/. 
Table II. 
Ouse. 
Thames. 
Channel. 
Peninsula. 
37 
11 
9 
7 
11 
29 
13 
7 
9 
13 
39 
17 
7 
7 
17 
4i 
Diagram 4. Distribution of 29 ‘Thames’ species. 
It is clear that these small assemblages are fairly diverse in floristic 
composition. In fact, only two species are common to all the districts, and 
to the approximately equal floras occupying the most widely-separated 
regions, Ouse and Peninsula, only 7 species are common. The index of 
U 2 
