EXPERIMENTAL EVOLUTION 539 



bur oaks, live oaks, etc.), and have thereby recognized 

 that certain kinds resemble each other closely enough to be 

 placed in one group with a group-name. All the com- 

 mon names of plants indicate the recognition of classes 

 a classification. 



FIG. 403. Linnaeus, the great classifier (1707-1778). He is wearing a 

 sprig of the twin-flower (Linncsa borealis), one of his favorite flowers, and 

 named after him by his friend, Gronovius. He is regarded as the father 

 of modern systematic botany. 



460. Evolution and Classification. Without the guiding 

 idea of evolution classification would be arbitrary and 

 artificial. Linnaeus classified plants on the basis of the 

 number of stamens they possessed, thus placing in one 

 group plants now known to be wholly unrelated, except 



