H. F. Wernham. 
146 
in not a few instances; and for this reason, coupled with the 
diplostemony of the andrcecium, we shall be prepared to find in the 
The Pentacyclid/e. 
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Pentacylidae a transitional group between Archichlamydeae and 
Sympetalae. We may now proceed to discuss each cohort in turn. 
Ericales. 
From the aspect of the economy principle, these will readily be 
regarded as a primitive group relatively to the Sympetalae. A 
glance at the table will reveal the fact that in the bulk of the 
species two whorls of stamens are present, the arrangement being 
typically obdiplostemonous. This arrangement is reflected in the 
Pyrolaceae, Clethracea? and Ericaceae, which groups include nearly 
