154 McATEE: VIBURNUM AND THE CAPRIFOLIACEAE 
appear, therefore, that the Caprifoliaceae have been treated as a 
separate family from the Rubiaceae on chiefly hypothetical 
grounds. Artificiality is hardly called for in this case since the © 
number of genera concerned, namely ten, is so small in proportion 
to the 350 of Rubiaceae that separating them does not significantly 
decrease the complexity of the larger group. 
